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OpenStudy (anonymous):

Invertebrates are the most commonly found fossils because they: have hard shells which preserve well die more often than vertebrates are buried deeper than other organisms secrete oxygen which helps petrify their bodies

OpenStudy (anonymous):

1st

OpenStudy (anonymous):

winner ^^

OpenStudy (anonymous):

because Shells are much more materially, and specially, dense [with Ca++]

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