Answer:
If for example food becomes scares for a group of birds they must now eat something else. these birds have two different beaks on large for the food currently going becoming spars and the other just small enough for them to eat the smaller nuts and survive. The birds who can not eat the small nuts will die and then the small beaked birds will become more abundant.
Explanation:
<span>Sponges have biradial symmetry, canal system, skeletal system, osculum as an outlet of water.
Moreover, they have pores in the body to let water come in. In addition,they also have choanocytes,gemmules etc and they are diploblastic. Whereas these functions are not found in protists.</span>
<span>
Gerbils do not consume a lot of water due to that they originated from desert environments.</span>
