What is the combination of alleles for a trait, shown as letters?? please help me i will mark brainliest

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

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