Which of these is not a characteristic of a mineral

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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

If animal agriculture was eliminated, how much grain would become available for human consumption?