Two populations are not yet reproductively isolated if interbreeding results in A. fertile offspring B. living offspring C. weaker offspring D. stronger offspring

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

20 the compound al(nh3)2 has atoms of nitrogen.