Astudent wants to perform an experiment to test how much water bean plants need for good growth. which of the following factors should be changed?
temperature
amount of light
amount of water
amount of soil

You should be changing the amount of water because the question isn't asking for temperature, amount of light, nor the amount of soil. You would be changing the amount of water because that is what you are experiment for.

It's cell theory. easy name i would think.

Ten percent of energy is transferred from sun to the level indicated.