A tapeworm needs to eat food that is already digested, so it lives in the intestines of a dogfish shark and derives nourishment from the shark. As a result of the tapeworm infestation, the shark is weakened and more vulnerable to disease and predation. What type of relationship is this?

parasitism

Explanation:

This is an example of parasitism, because the shark is not benefitting from this relationship, only the tape worm, making this relationship parasitism.

i think the answer would d

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.