Please help me answer this question!!

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water