What is often -- but not always -- a feature that accompanies the evolution of internal fertilization?
A)meiotically-produced oocytes
B)synchronized gamete release in a population
C)fusion of egg and sperm within the female
D)a male intromittent organ In internal fertilization, the oocyte is always retained.The population no longer has to synchronize gamete release.Male intromittent organs, such as penises, are often used for internal fertilization, but birds lack such a structure and simply align their cloacas.

Question

Quizplus · Accepted Answer

A male intromittent organ is often associated with internal fertilization to deliver sperm directly into the female, although not all species have such structures, as seen in birds.

What Is Often -- but Not Always -- a Feature