Illustration of the transitional genus primate known as the Proconsul, from which all apes and monkeys evolved

The Proconsul ransitional Genus and the subsequent species of Great Apes, including Man, Gibbon, Gorella, Chimpanzee and Orangutan.

Disections of lima bean (left) and corn bean (right)

The evolutionary family tree of animals according to widely held theory. The fossil record provides little evidence as to these relationships because there are few early fossils of soft-bodied invertebrates.

Diagram of interior passages of the human heart

The Salt Creek Pupfish lives in Salt Creek in the Death Valley. Depicted here is the male (left) and female (right) Pupfush.

Five species of living echinoderms

Fate of energy in the food of (a) black swallow-tail butterfly caterpillars; (b) white-tailed deer.