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?

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.

Explanation:

Organisms decompose faster when they are in contact with oxygen. When an organism is buried faster there is less decay and more likely to be preserved. The bones and shells of organisms become fossils.

Explanation:

softer tissue would decompose faster

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