Natural Selection and Adaptive Evolution

Natural selection is an evolutionary process that changes populations over time. Individuals with traits that help them survive and reproduce tend to leave more offspring. As those favorable traits are passed on, they become more common in the population or species.

These helpful traits usually b...

One of the most remarkable aspects of the natural world is the fit between organisms and their environments.

Coyotes, for example, have teeth and other traits that allow them to eat birds with ease. And the wings of birds, in turn, give them the chance to escape predators like coyotes.

Natural selection is the evolution...