OPT: (A). alveoli; (B). fusion; (C). embryos; (D). teats; (E). rings; (F). pollen; (G). food; (H). eyes;
Given those answer options, answer the question: Fact 1: Monotremes are mammals that reproduce by laying eggs. Fact 2: Unlike most mammals, female monotremes have no teats. Given the two facts above, female monotremes reproduce by laying eggs and have no what?
A:
(D).