Which is NOT a way that variation is added to a population?

Abnormal softening of a gland is known as

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 of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat