>:( I had a long explanation for this & the wifi spazzed out & now it's gone.
It's B, because homeostasis is the maintaining of stable internal conditions within an organism. If a contractile vacuole expels water, it's so the cell/protist can still function without being overrun with water & thus "drown," not being able to function.
I was going to have such a more thorough explanation than this. Ugh.
Hope this helps, though!
