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

Question

Quizplus · Accepted Answer

Terrestrial environments have lower humidity and thus, egg and sperm would dry out if released separately. This selective pressure led to the evolution of internal fertilization where sperm is transferred directly to the female's reproductive tract.

What Caused Intense Selective Pressure for Terrestrial Vertebrates to Evolve