How well an organism can survive and reproduce in its environment

Heritable characteristics that increase an organism's ability to survive and reproduce in an environment

Process by which organisms that are most suited to their environment survive and reproduce most successfully

Preserved remains of, or traces of, ancient organisms

Study of past and present distribution of organisms

Body parts that share a common function, but not an evolutionary history

Structures that are similar in different species that share a common ancestor

Structure that is inherited from ancestors but which has lost much or all of its original function.

Formation of a new species

States that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change.

Process by which two species evolve in response to changes in each other over time

Birds and butterflies both have wings, but they do not have a common evolutionary history. Bird and butterfly wings are examples of a(n)...

The forelimbs of lizards and frogs look different, but have the same bone structure. Since they have a common evolutionary history, their forelimbs are examples of a(n)...

Ostriches are large birds that cannot fly, however they still have wings because all birds have a common evolutionary history. Ostrich wings are an example of a(n)...