28. Explain the steps of embryological development that are shown in structures A, B, and D. Does this series of steps illustrate the development of a protostome or a deuterostome?
30. which structure—D or E—would you expect to develop into an invertebrate with bilateral symmetry?
(see image below)

Construct an explanation about the function of mitosis for multicellular organisms

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food