A student wants to find out if the amount of bleach has an effect on stain removal.

He plans to use two white shirts, stain each of them with mustard, and then wash each of them using bleach. He can change the size of the stain on the shirt and the amount of bleach he adds to the water.

Which test should the student set up?

Answer:

The second option.

Explanation:

We're trying to test the amount of bleach that has an effect on the stain so that is the altered variable.

The 2nd option uses different amounts of bleach to clean the same amount of stain.

If you choose the other options, people can argue that the bigger stain would be harder to clean with one cup of bleach, whereas the small stain gets two cups or the other way around.

It's not an effective way to see if the amount of bleach has an effect on stain removal.

any help would be very much appreciated!

20 POINTS

Writing Prompt (you will also see this within the assignment):


There are three challenges of life that all living things must overcome in order to survive.

Obtain energy.
Reproduce offspring.
Maintain homeostasis.

Choose two DIFFERENT organisms and describe how they EACH meet these challenges to survive. You can choose any organism: plant, mammal, reptile, insect, human, etc.

WARNING- NO PLAGARISM WRITE THIS IN UR OWN WORDS 20 POINTS WHEN U ANSWER IF IT GETS BE A B + OR ABOVE ILL GIVE U BRAINLIEST BTW MAKE SURE IT'S ATLEAST 1 PARAGRAPH

Plant and animal cells are surrounded by a cell membrane, but only plant cells have a rigid ______.

which reproduces slowest: bacteria, viruses, fungi, or protists? and why?

1. Bacteria can reproduce in as little as 20 minutes. Protists and fungi take hours or days to double in number or size. Why can bacteria reproduce at a much faster rate?
2. It takes 1-2 days from the time you catch a virus until you feel any symptoms. What is happening during that time?
3. How can asking a patient when his or her symptoms started help the doctor diagnose that person with a particular pathogen?
4. What challenges do you think doctors encounter when they try to diagnose patients with symptoms that are common to different pathogens?
5. Which pathogen do you think responds faster to treatments provided by doctors? Explain your reasoning.

A swim team thinks that the swimsuits and swim caps they use may affect the team's performance. The swim team decides to test if the swimsuits make a difference on how fast they can swim. They split the team in two groups. The two groups wear different kinds of swimsuits and different kinds of swim caps.

Why is their test invalid?


A.The swim team didn't have enough members.
B.They should have changed one variable, keeping the other the same.
C.They all swam different speeds on purpose.
D.Actually, the test is valid.

What happens to the brain after it is attacked with prions from a mad cow?
a.) swollen
b.) holey
c.) it shrinks
d.) it contains extra grey matte

A student is interested in the behavior of fish. He has 4 fish bowls and 20 goldfish. He puts the same number of fish in every bowl and puts them under light. He changes the temperature of each fish bowl, and he observes the behavior of the fish. What can the student find out from doing just this experiment?
A.If the temperature of the fish bowl and the amount of light affect the behavior of the fish.
B.If the temperature of the fish bowl affects the behavior of the fish.
C.If the number of fish, the temperature, and the amount of light affect the behavior of
D.If the number of fish in the fish bowl affects the behavior of the fish.

Joey looked at this picture and said "It must be raining outside." His statement is a(n)
A.inference.
B.quantitative observation.
C.prediction.
D.qualitative observation.

The work of good science involves __________.
A.
glorifying God
C.
neither A nor B
B.
showing love to your neighbor
D.
both A and B

how does the organization of the organism work together to function properly