___________________________ structures have a similar function but are structurally different because they evolved independently.

The movement of alleles from one population to another is known as genetic drift

Evolutionary change that occurs over long periods of time and results in the formation of a new species is known as _____________________________.

Populations (members of one species) have individuals with varying genetic traits. Some of these members will be well suited to survive and can gather sufficient resources (things needed for life). Other members may not be so fortunate and their genetic traits result in them struggling to gain enough resources. The result is these latter individuals may not be as healthy/fast/efficient as the first ones. In biology, fitness describes the first set of organisms and is the ability to: