In mammals, in which organ is the $Corpus Luteum$ found?

Which statement is correct regarding fertilization?

Fertilisation in humans is practically feasible only if

Which reproductive adaptation is characteristic of most terrestrial vertebrates but not of most aquatic vertebrates?

$A$: Every cell of the body contains the same genetic material as the zygote. $R$: The zygote is formed by the fusion of male and female gametes.

What is the typical survival time of sperms after being introduced into the female reproductive tract?