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