This is the longest unit of geologic time

This is the process that explains the survival of the fittest and shows how species change over time

These form when sediments bury an organism and change them to rock, the organism decays leaving a cavity behind.

What is most likely theorized to have ended the Mesozoic Era

What are eras broken down in to?

This is the geologic time span dominated by Marine life, shallow seas, early land plants and the first reptiles

These are fossils used to help determine the relative age of rocks and other fossils. They lived a short time

These are an example of an index fossil that lived during the Paleozoic Era

Which of the following would be considered a natural extinction factor?

These are differences in a population that can lead to natural selection

These form when minerals soak into the buried remains changing them into rock

Ice Ages occurred during the geologic time period causing it to be relatively cooler than other time spans.

This is the smallest division of geologic time

This was the earliest time of Earth's History which had little to no life.

What is the period in which we currently live in called?

This the geologic time span in which mammals were dominant, flowering plants are dominant and humans emerge

What states that each rock layer is older than the one above it?

Which of the following is an example of a man-made extinction factor?

Any trait or behavior that helps an organism survive and reproduce

These form when mud or sand hardens to stone where a footprint, trail, or burrow was left behind

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