What is the purpose of the part of the male reproductive system that is highlighted below

Explanation:

that is where sperm cells grow so that is the purpose of that

A. Stores sperm cells until they mature

Explanation:

Epididymis is a coiled tube like structure present at the top of the testes. Sperms are produced in seminiferous tubules of testes through the process of spermatogenesis. Sperms are delivered to epididymis from testes for storage. Sperms are matured and become capable of fertilizing egg cell in epididymis. Maturation of sperms refers to acquiring the ability of fertilization in epididymis.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

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.