Which of the following forms when a fossil mold is filled?

For fossils to form, the remains must be covered quickly by ____________.

___________ is a cavity in rock made when an organism decayed.

An important index fossil for the Paleozoic Era are

Which of the following animal parts would be most likely to form a fossil?

When minerals take the place of once-living materials, _________ fossils are formed.

Fossils are usually found in

By studying fossils of an animal's ___________, scientists can find out what the animal might have eaten.

________ are carbonized impressions of leaves, stems, flowers, and fish that are usually found in solft clay or mud.

Which of the following is an example of a trace fossil?

________ are remains of species that existed on Earth for a relatively short periods of time, were abundant, and were widespread geographically.

A fossilized dinosaur footprint is an example of

A tree buried in a mineral hot spring would probably form a _____________.

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