Water normally diffuses all through cells relying upon the convergence of solutes in both the cell and the outside condition. Osmosis occurs from where the solute fixation is least to where the solute focus is most elevated or all the more sensibly, water goes to weaken the solute; so envision if a cell with a ton of gunk in it swims into the unadulterated water, water will begin to move into the cell.
Unicellular organisms have contractile vacuoles that get rid of excess water. They are able to live in any environment that provides them with water. This can be tested by creating a negative control group and a control group with a group that has a factor manipulated.
I will have to say D) they keep the prey population low so they will be less likely to deplete resources such as food, water, and shelter... hope i helped!!
