Which characteristic is necessary for natural
selection to occur in a species?
(1) stability
(2) variation
(3) complex cellular organization
(4) a very low mutation rate

The cluster of developing cells from conception until birth is called an

Both male and female gametes are created during the process of meiosis. the formation of male gametes is called spermatogenesis. after telophase il of spermatogenesis, there would be are all genetically male gametes created that

Which of the following can be assumed about the layers in areas 2 and 4