Limestone deposits primarily originate from which of the following organisms?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
11 May 2018
Last updated
28 May 2026

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Explanation

Limestone is mainly formed from the calcium carbonate shells and skeletons of Foraminifera, microscopic marine protozoans. Zooflagellates, Actinopods, and Apicomplexa do not contribute significantly to limestone formation.

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