which two observations are most useful for explaining the trends in the data. select two answer choices

How does natural selection change thephenotypes within a population over time?

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

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f