What type of organism secretes calcium carbonate plates that overlap to form a spherical test? A. Coccolithophores
B. Decomposers
C. Dinoflagellates
D. Diatoms

A. Coccolithophores

Explanation:

Coccolithophores are organisms that are single-celled, and secret calcium carbonate plates. They produce calcium carbonate plates that is referred to as coccoliths.

These organisms absorb carbon dioxide during the production of their food. After its death, the calcium carbonate can be collected from the remains. Therefore causing an increase generally in the carbon deposits.

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