Trilobites can be used to study the passage of geologic time because_______.

A trace fossil is all of these except

Index fossils are

Examples of Permineralized Remains

Examples of Original Remains

What does a fossil need to form?

Everything is made up of ______

What principle states that the oldest rock layer is on the bottom?

Gaps in the rock layers are

The best evidence that two land areas were once connected is the discovery that both have land masses

A type of fossil that is the hollow shape of an organism

Carbon Fim is

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