What set of fitness levels most likely produced the allele graph shown below

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

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above