Why must multicellular organisms keep their cells awash in an "internal pond" of interstitial fluid?
A.This phenomenon occurs only in aquatic organisms because terrestrial organisms have adapted to life in dry environments.
B.Negative feedback will only operate in interstitial fluids.
C.Cells of multicellular organisms tend to lose water because of osmosis.
D.Cells need an aqueous medium for the exchange of nutrients, gases, and wastes.
E.Cells of multicellular organisms tend to accumulate wastes, a consequence of diffusion.
Answer Key: D