How does the body avoid damaging the digestive enzymes in the small intestine with this strongly acidic ph as the food passes out of the stomach?

Why is excretion necessary to maintain homeostasis?

Which could be a pathway of food through an ecosystem

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.