A scientist who studies fossils is a(n)

A vertebrate with 4 limbs is called a(n)

Any remains, trace, or imprint of animal or plant life preserved in Earth's crust is a(n)

The variety of life that exists in a particular habitat or ecosystem is known as

When a group of organisms is entirely destroyed, it is known as

An animal that does not have a backbone

An animal that has a backbone

The theory that states that sedimentary rock found on the bottom is older than the rocks on top of

A living thing

All the fossils on Earth are the

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