In order for multicellular organisms to maintain homeostasis a. their cells must continually grow in size. b. their organ systems must work together. c. their cells must all be identical. d. each cell must act like an individual organism.

I'd assume it's B, it makes the most sense. If cells acted alone, it probably wouldn't work out. If all cells were the same, you wouldn't really have an organism that would have to worry about homeostasis. If they all grew in size, there would be giant amoeba everywhere :D

Everything that you need in a lab is in your lab

Control variable- changedependant variable- stays the samechanging- food itemsdependant- presences of proteins