What caused intense selective pressure for terrestrial vertebrates to evolve internal fertilization?
A. There is no mechanism for eggs and sperm to find one another.
B. Terrestrial organisms only produce small quantities of gametes.
C. The eggs are too small for the males to find and fertilize.
D. The gametes could not be released next to each other, as they would soon dry up.
E. Gametes and zygotes are vulnerable to predators.
Answer: D
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