Iridium content in asteroids and comparable extraterrestrial entities is higher than that of the Earth's crust.
One reason the presence of iridium leads scientists to hypothesize that a meteorite impact caused the mass extinction of dinosaurs and Iridium content in asteroids and comparable extraterrestrial entities is higher than that of the Earth's crust.
Asteroids and other such extraterrestrial bodies have higher iridium contents than the Earth's crust, therefore the Alvarez team reasoned that the iridium layer must be made of the dust from the vaporized meteor. This led them to believe that an asteroid impact caused the extinction.What is one explanation for iridium's presence?The Earth's crust contains an extremely small layer of iridium. This is supposed to have been brought on by a big meteor or asteroid striking the planet. Iridium concentrations are higher in meteors and asteroids than in the crust of the Earth. The iridium would have been dispersed over the earth by the impact's massive dust cloud.To learn more about extinction of dinosaurs visit:
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The very simplest members of the order pythiales (oomycota) have a _____ thallus (chytridlike) that may occur entirely within the living host.
The very simplest members of the order pythiales (oomycota) have a monocentric, holocarpic thallus (chytridlike) that may occur entirely within the living host.
The Oomycota are a huge and diversified collection that includes two main (class level) clades, the Saprolegniomycetes and Peronosporomycetes and other early diverging classes, the majority of which are basic holocarpic creatures with no mycelial organization. The early-diverging orders include the marine seaweed parasites Eurychasmales and Olpidiopsidales, the worm infecting Haptoglossales, and the crab infecting Haliphthorales. The Saprolegniomycetes, which include the orders Atkinsiellales s.lat., Leptomitales, and Saprolegniales, are usually saprophytes or parasites of invertebrates and, on rare occasions, vertebrates such as fish and amphibians.
Peronosporomycetes have a variable thallus shape, ranging from a mycelium of hyphae (similar to Mycota hyphae, with tip growth) to allantoid or ellipsoid (holocarpic) cells, or monocentric and eucarpic thalli with an assimilative system formed of branching rhizoids. Obligate parasites can be endobiotic (completely contained inside a single host protoplast), intracellular (some hyphae entering the protoplasts of a host thallus), or intercellular with specialized side branches (haustoria) that pierce the host cell walls but not the protoplasts.
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Which statement about the use of models in science is true?
A.
Scientific models must be complex.
B.
Scientific models never change once they are created.
C.
Scientific models do not have any limitations.
D.
Scientists use models to represent and predict real phenomena in the world.
Scientists use models to represent and predict real phenomena in the world.
By contrasting aspects of the real world with models based on well-known systems, scientists attempt to explain certain parts of it. Scientific models must be testable, and they are only approved by scientists after undergoing real-world testing.To explain how some features of the real world function, scientists create models. A scientific model is made up of ideas and concepts as well as a mechanism of some sort. Mathematics is used to create and study a wide variety of models, and computers enable extremely complex mathematical models. There are many conflicting theories for the same phenomenon.It's difficult to find good models. They cannot be created based solely on whim or desire. Models need to be based on reliable scientific concepts.Therefore, option D. is correct.
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According to linnaean taxonomy, what is the most specific category and level shared by humans, gorillas, and howler monkeys (from the new world)?
The most specific category and level shared by humans, gorillas, and howler monkeys (from the new world) are Suborder Anthropoidea.
What is suborder Anthropoidea?Anthropoidea is a suborder of primates that includes humans, gorillas, and monkeys. Anthropoids are larger than prosimian primates and have flatter, more human-like faces. They also have larger brains.
Unquestionably apes, dryopithecines lived in the following Miocene. According to the conventional palaeontological theory, these Miocene apes gave rise to three new lineages in turn, one of which led to gibbons, another to big apes, and the third to humans.
However, it has long been held that the ancestors of both gibbons and orang-utans diverged from the ancestral line of the advanced Primates at an early date and that this line only later split into two groups, one of which included humans and the other of which included the gorilla and the chimpanzee; recent palaeontological evidence now tends to support this second view.
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The rna responsible for bringing the amino acids to the ribosomes for protein synthesis is ___.
The RNA responsible for bringing the amino acids to the ribosomes for protein synthesis is tRNA.
In the field of science, Ribonucleic acid (RNA) can be described as a nucleic acid molecule that is single-stranded. RNA plays important functions such as helping is coding and decoding of the genome.
During the process of transcription, mRNA is formed from the DNA. These mRNA is referred to as transcripts that have a coding sequence for the formation of proteins. The mRNA carries a sequence for proteins in the form of codons. These codons have complementary amino acids which are brought to the ribosomes by the tRNA.
In the ribosomes, where the formation of protein has to occur, it is the transfer RNA (tRNA) that brings the amino acids to the ribosomes for protein synthesis.
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The primary interaction of muscles and the nervous system involves the alpha motor neurons, which originate in the ________, exit through the ________, and terminate in the muscles.
The primary interaction of muscles and the nervous system involves the alpha motor neurons, which originate in the spinal cord, exit through the ventral root, and terminate in the muscles.
Spinal Cord- The spinal cord is a lengthy band of tissue that resembles a tube. The spinal cord relays nerve messages back and forth between the body and the brain. These nerve messages facilitate the body's mobility and senses.
Ventral Root- Motor and visceral efferent fibers' axons, known as ventral root fibers, arise as ventral rootlets from the ill-defined ventral lateral sulcus. The ventral root, which contains motor nerve axons from motor and visceral motor neurons, is formed when the ventral rootlets from separate spinal cord sections combine.
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In medicine, a complete living entity capable of independent existence is called a/an: _______
a. animal
b. organism
c. human being
d. creature
e. man
In medicine, a complete living entity capable of independent existence is called an b.organism.
In the field of medicine, an organism can be described as a living, independent entity. An organism is made up of one or more than one cells. Hence, the correct option is b. organism.
An organism can show the seven basic life principles. They can show movement. They can reproduce. They can show sensitivity to various stimuli. They can respire. They can carry out the process of excretion. They use nutrition as a source of energy and they can grow.
An organism has an organized structure that helps in the maintenance of the organism.
Other options, such as option c, is not correct as although the human being is a complete living entity but all other organisms also fall under this criteria. Human beings are organisms.
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Cardiovascular disease and cancer are the greatestc auses of death in the united states
a. true
b. false
Cardiovascular disease and cancer are the greatest causes of death in the united states. The given statement is true.
What is cardiovascular disease?
Cardiovascular disease is defined as disease related to heart such as high blood pressure, heart attack, and blockage in heart. Cancer is unwanted and unusual division of cell in the form of tumor which is known as cancer.
A circulatory system is defined as a system in the body that consists heart, blood vessels, arteries, veins and blood that all combined together to supply blood to all parts of body and takes up waste material from it.
Circulatory system have four major components and these are heart, veins, arteries, and blood. These are the four components that combined and form cardiovascular system.
Therefore, Cardiovascular disease and cancer are the greatest causes of death in the united states. The given statement is true.
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_____________ bacteria lack an outer membrane, have a thick layer of peptidoglycan, contain teichoic acid, and lack mycolic acid.
Gram positive bacteria lack an outer membrane, have a thick layer of peptidoglycan, contain teichoic acid, and lack mycolic acid.
Gram Positive Bacteria- Gram-positive microorganisms are identified by the color they take on when stained. The staining technique was invented by Hans Christian Gram in 1884. The peptidoglycan cell wall present in gram-positive organisms retains the crystal violet dye used in the staining process.
Peptidoglycan cell wall- In most bacterial species, the cytoplasmic membrane is encased in a hard material called peptidoglycan. It helps maintain cell shape throughout the life cycle and shields bacterial cells against environmental stress. The production of peptidoglycans has a significant role in controlling bacterial cell division.
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Which four of the following entities are generally included in the field of microbiology? multiple select question. viroids mosses archaea insects bacteria slime molds
Bacteria, Viroids, Slime Molds, and Archaea are included in the field of microbiology.
Microbiology is the study of microscopic or microorganism that can be cellular, acellular, unicellular, and multicellular. It has different branches of study like immunology, mycology, phycology etc. It is very beneficial stream which help us know about the growth pattern and habits of disease causing pathogens like virus, bacteria, and viroids etc.
Microorganism are versatile creatures and their detailed study helps to know about the vital role they play which can be further used in the benefit of humans like creating, vaccines, medicines, biotechnology, antidotes, products, etc.
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Denise just received the results of a complete physical that found her body is not producing enough insulin. which part of the endocrine system is affecting her body's ability to produce insulin?
The part of the endocrine system which affects her body's ability to produce insulin is referred to as the pancreas.
What is Insulin?This is defined as substance which is secreted into the bloodstream by the organ known as the pancreas and is leaf shaped. Its mode of action is to allow glucose to enter the body's cells to provide energy.
Insulin helps to regulate the blood sugar or glucose level in the body and a deficiency will lead to diabetes which comes with a lot of complications and risks.
This is therefore why pancreas was chosen as the most appropriate choice.
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Martha's child was born with an extra chromosome, resulting in down syndrome. this is an example of:________
Martha's child was born with an extra chromosome, resulting in down syndrome, which is an example of a chromosomal condition called trisomy.
What is a trisomy?A trisomy is a genetic condition in which there is one extra chromosome in all somatic cells present in an individual, which is due to the faulty separation of chromosomes during meiosis.
In conclusion, Martha's child was born with an extra chromosome, resulting in down syndrome, which is an example of a chromosomal condition called trisomy.
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The __________ houses the nucleus and other cell parts. a. neural receptor b. myelin sheath c. cell body d. axon terminal please select the best answer from the choices provided a b c d
Answer:
Explanation: cell body
Identify the location of the majority of triglyceride digestion.
The location of the majority of triglyceride digestion occurs is small intestine.
Where does the majority of the digestion of triglycerides take place?Lingual lipases, which are released by tongue glands to start the digestion of triglycerides, cause lipid digestion to start in the oral cavity. Gastric and lingual enzymes both contribute to continued digestion in the stomach.Where are the locations where triacylglycerol fat is metabolized?The mouth is the entry point for lipid digestion, which continues in the stomach and concludes in the small intestine. Lipase is the name of an enzyme that aids in the digestion of triacylglycerol. These are proteins that catalyze the conversion of triglycerides into a mixture of free fatty acids and acylglycerols through partial hydrolysis.To learn more about triglyceride digestion visit:
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Which statements describe scientific laws but not theories or hypothesis?check all that apply
They don't offer justifications for why they are accurate. They are regarded as established facts.
A theory essentially means the opposite. A well-supported explanation of a phenomenon in the natural world, including laws, hypotheses, and facts, is called a theory.A hypothesis is a statement about the natural world that can be verified by observations or tests. Hypotheses must be falsifiable—that is, they must be formulated in a fashion that allows them to be disproven—and be evaluated scientifically in order to be considered to be true.Scientific laws or laws of science are propositions that describe or forecast a variety of natural occurrences and are based on repeated tests or observations.Scientific rules condense the findings of tests or observations, typically within a specific applicability range. The accuracy of a law typically does not change when a new theory of the relevant phenomenon is developed; rather, the law's application area expands because the mathematics or statement that represents the law remains constant.Therefore, scientific laws, theory, and hypothesis are different aspects of Science.
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In 2003, tyrone hayes proposed that pesticides could be the cause of worldwide amphibian declines. this statement is an example of?
In 2003, Tyrone Hayes proposed that pesticides could be the cause of worldwide amphibian declines. This statement is an example of hypothesis.
Pesticides are the chemicals used to kill or slow the growth various pests and small insects in the farm fields. These pesticides can be harmful to other species as well. Pesticides are further divided into three types: insecticides, herbicides and fungicides.
Amphibians are the vertebrate animals that live in land as well as water. These are cold-blooded animals. Most of the amphibians have a moist skin and may have scales on their body. The example of amphibians are: toads, salamanders, newts, etc.
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The maximum central nervous system (cns) effect of caffeine is reached about _________blank after drinking coffee
The maximum central nervous system(CNS) effect of caffeine is reached 1-2 hours after drinking coffee.
Coffee contains caffeine, which is a central nervous system stimulant.
Stimulants are those substances that act on the CNS and increase the alertness of both our body and mind.
Caffeine also acts on other parts of the body like the heart, muscles, airways, etc.
It is also present in other drinks like tea, soft drinks, etc.
When we drink coffee, it gets absorbed from the stomach and the small intestine in about 15 minutes.
From there it enters our bloodstream and reaches its maximum concentration around 1-2 hours after consuming coffee.
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The location where infectious organisms can multiply and accumulate is referred to as the _____
The location where infectious organisms can multiply and accumulate is referred to as the reservoir.
Infectious organisms are those that cause disease in other species They are also called pathogens. They can be bacteria, virus, protozoans, etc. The organism can cause disease either by living inside the body or even by living outside the body.
Reservoir is simple words is the habitat of an infectious organism. This can be humans, animals and also plants. On the basis of their locations, reservoirs are of three types: human, animal (non-human), and environmental. The infectious organisms from environmental reservoirs can be transmitted to the host by several modes of transmission.
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Which dye would you predict to move the fastest (and thus go furthest in a given time period) through agar?
Potassium permanganate dye would pass through agar the fastest and travel the furthest in the shortest amount of time.
What is dye?
Dye is a component, either natural or artificial, used to give something color or to change the hue of something. It helps us in finding faults, leaks, etc.
Potassium permanganate (KMnO₄) (molecular weight = 158) can be used for fast results. It travels fastest through agar in shortest amount of time.
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Living organism(s) composed of one or more cells with a distinct nucleus and cytoplasm are:________-
Living organism(s) composed of one or more cells with a distinct nucleus and cytoplasm are eukaryotes.
In the field of science, eukaryotes can be described as those kinds of organisms that have well-defined nucleus. On the other hand, prokaryotes are organisms that lack a membrane-bound nucleus.
A eukaryote can be single-celled or possess more than one cell. The genome of eukaryotes is present inside the nucleus of a cell. For prokaryotes, who lack a well-defined nucleus, the DNA is present inside the cytoplasm.
The eukaryotes have numerous kinds of organisms such as animals, plants, protists, etc.
The eukaryotes cell is properly organized with various organelles which play an active role in the maintenance of an organism. The cytoplasm is the fuid-like organelle in which all the other organelles of a cell float.
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Which of these traits have been found by twin studies to be strongly hereditary? liking of spicy foods dislike of romance movies dancing ability schizophrenia stubbornness
Schizophrenia traits have been found by twon studies to be strongly hereditary.
What is hereditary?Hereditary theory holds that many physical characteristics can be passed down from generation to generation via DNA, by passing on the set of instructions or genes in your DNA to your offspring.
Heredity in biology refers to the transmission of genetic factors from parents to offspring or from one generation to the next. The biological definition of heredity may also refer to the association of a specific trait with an individual organism's genetic constitution rather than environmental conditions.
Eye color is an example of DNA.
There are four types of hereditary
Dominant, recessive, Co dominant, intermediate.
It is more likely that different combinations of genes make people more vulnerable to the condition. However, having these genes does not guarantee that you will develop schizophrenia. Twin studies provide evidence that the disorder is partially inherited. The same gene is shared by identical twins.
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Which molecule can function as a recognition signal for interactions between animal cells?
Glycolipids molecule can function as a recognition signal for interactions between animal cells.
Describe glycolipids:Lipids having a carbohydrate connected by a glyosidic bond are known as glycolipids. Their job is to keep the cell membrane stable and make it easier for cells to recognize one another, which is essential for the immune response and for the connections that allow cells to join together to form tissues.
What use do glycolipids function?Glycolipids are crucial parts of biological membranes that serve a wide range of purposes. They might function as receptors, be necessary for cell aggregation and dissociation, be in charge of particular cellular interaction, and be involved in signal transduction. This protein does not transport phospholipids; instead, it largely transports various glycosphingolipids and glycerol glycolipids between internal membranes.
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Comparisons of amino acid sequences can shed light on the evolutionary divergence of related species. If you were comparing two living species, would you expect all proteins to show the same degree of divergence?.
When all else is equal, the length of time since two organisms shared an ancestor determines the degree of divergence. But not all other things are created equal.
How are relatedness in organisms and categorization determined using DNA and amino acid sequences?Proteins and nucleic acids (DNA and RNA) are "information molecules" because they store a history of an organism's evolution.The amino acid sequence of a protein is determined by its DNA sequence, therefore two organisms that share a gene ought to have similar or even identical amino acid sequences. That's because recently in evolutionary history, closely related species are likely to have diverged from one another. Evolutionary relationships that might otherwise go undiscovered might be discovered by comparing the amino acid sequences in homologous proteins of comparable and varied animals.Learn more about the Evolution with the help of the given link:
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What part of a cell is the site of rrna synthesis, and is also responsible for the assembly of ribosomal subunits?
What area of a cell is the location of rRNA synthesis and is also in charge of ribosomal subunit assemblage?
What is rRNA?
Ribosomal RNA (rRNA), a molecule in cells that is transferred to the cytoplasm and is a component of the protein-producing organelle known as a ribosome, aids in the conversion of messenger RNA (mRNA) into protein. rRNA, mRNA, and transfer RNA are the three main forms of RNA found in cells (tRNA).
Nucleolus area of a cell is the location of rRNA synthesis and is also in charge of ribosomal subunit assemblage.
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Why are the ends of the a band the darkest region of the sarcomere when viewed under a microscope? (choose the best response)
This is because thick and thin filaments intersect there, the ends of the A bands are where they are darkest.
The primary contractile unit of muscle fiber in skeletal muscle is the sarcomere. The protein filaments (myofilaments) that make up each sarcomere are mostly the thick myosin and thin actin filaments. The term "myofibril" refers to the collection of myofilaments.
What are A-bands?
Anisotropic bands of the sarcomere include the A-bands.A-Bands are dark when viewed up close.The H zone, a large light zone, is located in the middle of a band.Primary myofilaments and fragments of secondary myofilaments are found in A-bands.A-band length doesn't alter while the muscle contracts.To learn more about sarcomere visit the link:
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True or false: phospholipids that are part of a cell membrane contain only unsaturated fatty acids.
True
The statement phospholipids that are part of a cell membrane contain only unsaturated fatty acids is true.
Phospholipids that are part of a cell membrane contain only unsaturated fatty acids.
Are unsaturated fatty acids present in all phospholipids?Cells can transport molecules around and divide to create new cells thanks to flexible membranes. Each phospholipid contains two fatty acids, which are large chains of atoms. There are numerous different fatty acids, but due to differences in their chemical makeup, they are usually divided into saturated and unsaturated groups.Which fatty acid is found in cell membrane phospholipids?Omega-3 fatty acids EPA and DHA are frequently incorporated into the phospholipid molecule of marine phospholipids.In cell membranes, are fatty acids saturated?After the inclusion of saturated fatty acids longer than 15 carbon atoms and the addition of unsaturated fatty acids, the usual percentage of unsaturated fatty acids in LM cell membrane phospholipids (63%) was decreased to 35–41% and increased to 72–82%.To learn more about phospholipids visit:
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The most numerous of the leukocytes is the __________.
a) basophil
b) monocyte
c) eosinophil
d) neutrophil
e) lymphocyte
Answer:
D. neutrophil
Explanation:
because they are phagocytic and have light colored granules
In the gram-positive bacterial cell wall, the tetrapeptides that extend from the peptidoglycan layers are linked by?
In the gram-positive bacterial cell wall, the tetrapeptides that extend from the peptidoglycan layers are linked by Peptide interbridges
The tetrapeptides can be directly cross-linked to one another, with the D-alanine on one tetrapeptide binding to the L-lysine/ DPA on another tetrapeptide. In many gram positive bacteria there is a cross-bridge of five amino acids such as glycine (peptide interbridge) that serves to connect one tetrapeptide to another
What are gram positive bacteria ?A lipopolysaccharide-containing outer membrane surrounds the peptidoglycan cell wall that encases gram-negative bacteria. Instead of having an outer membrane, Gram-positive bacteria are surrounded by layers of peptidoglycan that are much thicker than those seen in Gram-negative bacteria.
Christian Gram, a bacteriologist, developed a test in 1884 that could tell whether a bacterium possessed peptidoglycan, a thick membrane that resembled a meshwork. Gram positive bacteria have thick peptidoglycan. Thin peptidoglycan layers are indicative of gramme negative bacteria.Learn more about Gram positive bacteria here:
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Traits (such as sitting, walking) that emerge under a wide range of experiences and do not have to be taught emerge through a process known as ______________. group of answer choices
Traits (such as sitting, walking) that emerge under a wide range of experiences and do not have to be taught emerge through a process known as canalization.
What does trait necessarily mean?Curiosity is one of her standout qualities (as a personal characteristic). a trait that was passed down. a pencil stroke or an impression of one. Feel, trace.
Which 3 categories of traits are there?All ports divided these characteristics into three groups: cardinal characteristics, central characteristics, and secondary characteristics. Cardinal qualities are those that are so pervasive that they show up in a variety of contexts and areas of a person's life.
What makes trait theory important?The trait theory offers useful insights into leadership. People at various levels and in all kinds of organizations can use it. Managers can use the information in the theory to analyze their place in the company and how they are performing in that position.
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The process of using a carrier to passively transport a solute through a membrance down its concentration gradient is known as?
The process of using a carrier to passively transport a solute through a membrane down its concentration gradient is known as facilitated diffusion.
What is cell membrane?The cell membrane, a biological barrier, encloses each cell's interior from the outside world.A lipid bilayer that comprises of two phospholipid layers with cholesterol dissolved in them in between makes up the cell membrane.Because of its configuration, the membrane may remain fluid at various temperatures.Membranes are composed of membrane proteins, such as integral proteins that cross the membrane and serve as membrane transporters and peripheral proteins that only cling to the outside membrane of the cell and serve as enzymes to assist the organism in interacting with its environment.The glycolipids contained in the outer lipid layer serve a similar purpose.The cell membrane controls the movement of substances into and out of cells and organelles because it is only permeable to ions and organic molecules.
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Classifying microorganisms poses a greater challenge compared to higher organisms largely because _
Microorganisms, often known as microbes, are minute organisms that can be either single cells or colonies of cells. Ancient texts, including those found in India's Jain scriptures from the sixth century BC, express suspicions about the potential existence of unseen microscopic life. bacteria, archaea, fungus (yeasts and molds), algae, protozoa, and viruses are the main categories of microorganisms.
Why microorganisms are important ?In addition to producing oxygen and carbon dioxide, microorganisms also fix atmospheric nitrogen into forms that are useful to a variety of creatures. They contribute to the gut microbiome, which aids in the digestion of food by animals. Some microbe species are symbiotic by nature.
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