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Some fossils are the O life in shells O casts of shells O minerals in shells​

User RinoTom
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Answer:

Remember, "skeletons" include bone, the protein shell of crabs or insects, the sturdy ... This mineral makes up the bones and teeth of vertebrates and the shells of ... Some organisms make skeletons of large calcite crystals, as in belemnoids and ... organism were compressed and heated, driving off all the volatiles (H, N, O).

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User Markus Meyer
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