_______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments.

Name: _______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments.
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The Answer of _______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments.

_______________ Are Fossilized Remains of Colonies of Single-Celled Organisms That