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Microorganisms also exist in the fossil record, but they’re rarer than other types of fossils. The most common fossils form from hard body parts, such as bones, teeth, and shells. Why do you think these fossils are more common than fossils of other soft tissues or microorganisms?

User AST
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Answer:

When the decomposing process of an organism is taking place, it is breaking apart the nutrients within the organism in order to return it to the Earth in itself. When an organism buried at a quicker pace it cause the decomposing process to last at a longer time, which in term makes the chance of it being better preserved in at the same time. Due the bones of different organisms we are able to analyze the organism that has decomposed, because once that time of decomposition is complete we will be able to see the fossils of the organism and the evaluate the categorization of the specific organism that a scientist is examining.

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User Chisato
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Answer:

Organisms decompose more quickly when they are in contact with oxygen. ... When an organism is buried quickly, there is less decay and the better the chance for it to be preserved. The hard parts of organisms, such as bones, shells, and teeth have a better chance of becoming fossils than do softer parts.

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User Mano Marks
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