Which of the following is not dependent on sunlight as a source of energy?

No two species can occupy the same niche indefinitely without competition driving one to ________.

The kidneys are important homeostatic organs, contributing to the stability of all of the following except

What structure in the mammalian brain is enlarged and is responsible for higher mental processes?

The villi and microvilli on the surface of the small intestine

The rhythmic contractions of the esophagus are called

Bone—forming cells are termed

A species that interacts in critical ways with many other elements of an ecosystem is called a ___________ species.

The uterine lining proliferates during the female cycle and then sloughs off in the process of

The vertebrate kidney produces a fluid called _____________ that enters tubules and is modified to become urine.