Which of the following are factors that both unicellular and multicellular organisms actively balance in order to achieve homeostasis?
a)size, shape, and mass
b)texture, density, and flexibility
c)wastes, nutrients, and water
d)sound, light, and temperature
can any one explain this one for me

C) wastes, nutrients, and water.
Those are all properties organisms need to survive with, to achieve homeostasis (maintaining balance) the organism needs to regulate that.

(Size shape and mass don't make sense, texture doesn't make sense, neither does light)

I think of it like imagining a bear, do they maintain size during hibernation? No, maintain light? No.