Some Large Fish Allow Smaller Fish to Swim Inside of Their

Multiple Choice

Some large fish allow smaller fish to swim inside of their mouths without eating the smaller ones.The smaller fish____________________________get to feed inside the larger fish's mouth,the larger fish gets parasites removed from its teeth.This is an example of

A) reciprocal altruism.
B) kin selection.
C) audience inhibition.
D) the cost-reward model.