This period covers the first 4 billion year's of Earth's history

The gradual change in a species over time

A trait that helps an organism survive and reproduce

Body parts that are structurally similar in related species and provide evidence of a common ancestor

A copy of the shape of the organism that made the mold

The time it takes for half of the atoms in a radioactive element to decay

Diagram that shows how scientists think different groups of organisms are related

Process where individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species

The Jurassic period was...

A conifer is an example found in what time?

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