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Biology 21 Online
OpenStudy (anonymous):

Discuss four types of fossils and how they are formed?

OpenStudy (anonymous):

mold fossils (a fossilized impression made in the substrate - a negative image of the organism) cast fossils (formed when a mold is filled in) trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.) true form fossils (fossils of the actual animal or animal part).

OpenStudy (anonymous):

thank you

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