An animal that has a backbone.
An animal that does not have a backbone.
A type of cell that organisms have.
An inherited behavior that does not depend on the environment or experience.
A behavior that has been learned from experience.
A biological daily cycle.
When an organism moves a large distance over a period of time.
A substance that is released by the body and that causes another individual of the same species to react in a predictable way.
An animal that has an irregular shape.
An animal that can use body heat from chemical reactions in the body's cells to maintain a contant body temperature.
An animal whose body temperature varies with the temperature of its surroundings.
A cold-blooded vertebrate typically living on land but breeding in water.
A phase in the life cycle of many animals during which a rapid change from the immature form of an organism to the adult form takes place.
An organism thats actions or health can indicate that environment is unhealthy.
any cold-blooded vertebrate.
To sit on or cover eggs to keep them warm until they hatch.
any warm-blooded vertebrate having the skin more or less covered with hair.