A response to a stimulus that is inborn.

How well an organism can survive and reproduce in its environment.

The preserved remains or traces of an organism that lived in the past.

The young organism that develops from a zygote.

The transfer of pollen from male reproductive structures to female reproductive structures in plants.

A type of natural selection that acts on an organism’s ability to get the best possible mate.

The sprouting of the embryo out of a seed.

A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce.

Change over time; the process by which modern organisms have descended from ancient organisms.

The regular, seasonal journey of an animal from one place to another and back again.

The process by which two species evolve in response to changes in each other over time.

The natural process by which something takes place.

An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment.

The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time.

Behavior patterns related to how animals mate.

The process by which organisms that are best adapted to their environment are most likely to survive and reproduce.

A well-tested explanation for a wide range of observations or experimental results.

Structures that are similar in different species and that have been inherited from a common ancestor.

All the fossils that have been discovered and what scientists have learned from them.

A relationship in which one organism lives inside another organism's cells.

Term used to describe a group of related organisms that has died out and has no living members.