an animal that does not have a backbone

an external skeleton that is made of protein and chitin and that covers the outside of an arthopods body

An animal with a skull and a backbone; also called chordates

an animal that maintains a constant body temperature; called warmblooded

an animal whose body temperature chages with the temperature of its environment; called coldblooded

the process by which population accumulate inherited traits; change over time

physial evidence of a living thing such as its remains or imprints found in rocks

a characteristic that helps organism survive and reproduce

a distinguishing quality that can be passed from parent to offspring

a change in the hereditary infromation called dna of an organism

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