Which process takes place in muscle cells when they do not get enough oxygen? electron transport chain cellular respiration lactic acid fermentation ethyl alcohol fermentation

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

What organs comprise the respiratory system of a bird

Match each term to its scientific definition. a)natural world b)scientific method c)theory 1) everything that can be observed or explained scientifically 2) a well-supported explanation of all the evidence related to a natural phenomenon 3) the procedure of scientific inquiry used to investigate natural phenomena