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Chalk and limestone were formed of shells (cm)?

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Correct answer is # 3. Chalk and limestone formed from the shells of aquatic protozoa, foraminifer. Foraminifera (Foraminifera lat.) one classification type for another class of shell organisms from the group of protists (protozoa). Data simple stripped rigid external skeleton in the form of a shell which is formed by the body. After the death of such a simple shell falls to the bottom and is compressed, if the process is long and the layer of shells to gain a lot of formed limestone deposits which can reach a pretty impressive thickness. The shells of various protozoa and foraminifera.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\pastor question chose this answer best
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