What is the study of where organisms live now and where they and their ancestors lived in the past?

Similar but distant habitats caused some organisms to develop similar adaptations. These organisms are

Why are fossils important evidence for evolution?

Fossils can provide evidence for common ancestry because they show organisms with similar structures likely used for similar purposes. These are called           structures.

Hipbones in the ancestors of dolphins played a role in terrestrial locomotion. Hipbones in modern dolphins are called           structures.

          structures share a common ancestry, but not necessarily a common function, while           structures share a common function but do not share a common ancestry.

Similar patterns of embryological development provide evidence that organisms have descended from a(n)

At the molecular level, overwhelming similarities in the           of all organisms, along with clearly homologous molecules, provide evidence of common descent.

With what concepts have the Grants been working?

The Grants are testing Darwin's theory of natural selection by?

Homologous structures, such as arms, wings, and fins, are constructed from the same basic bones and are adapted to locomotion in different environments. Such structures support the idea of

Because they are made up of similar bones, the flippers of whales and the wings of birds are examples of

By hunting at different times of day, hawks and owls are able to reduce

Some of the bacteria found in the human digestive system help us to break down and digest food. In return, the bacteria obtain food and nutrients. This type of relationship is known as