A) occurred for millions of years but is no longer occurring. B) is extinction. C) is germination. D) occurred only once in Earth's history. E) is speciation.
The type of reproductive isolation in which two populations are separated due to the sperm cells of one not being able to fertilize the egg cells of the other is
A) gametic isolation. B) ecological isolation. C) temporal isolation. D) hybrid infertility. E) hybrid inviability.