Cells must be in osmotic equilibrium with their surrounding environments, because if they swell or shrink their membranes will rupture. a) animal b) bacterial c) fungal d) plant

A)animal cells must be in osmotic equilibrium with their surrounding environments, because if they swell or shrink their membranes will rupture.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.