Homologous, Analogous, and Vestigial Structures Test

Example of Homologies:

A whale has flippers to swim, while cats have the same structure to walk.

Homologous Structure

A body part that is from a common ancestor of different animals, but have different purposes.

Vestigial Structure

A body part that is left over from evolutionary past but is not fully developed and does not serve the same purpose as before.

Analogous Structure

A body part that serve the same purpose, but are not from common ancestors.

Example of Analogies:

A moth and bird can fly, but have different structures.

What are tetrapods?

Animals with four legs.

What is embryology?

It is the science of developing embryos.

How are homologous and vestigial structures alike and different?

They are both from common ancestors and serve different functions, but one shows up in the animal while the other is undeveloped.

What is evidence that whales used to be mammals?

They have hip bones.

How do vestigial structures show an organism's past?

They show how animals have common ancestors with the specific trait.