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
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.
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What will be an ideal response?
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