A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of ________.

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The snail-like, coiled, porous test made of calcium carbonate is characteristic of foraminiferans, which are single-celled protists with a shell of calcium carbonate. Diatoms also have a shell of silica, but they do not have a snail-like, coiled shape. Ciliates are a separate group of protists that do not have a shell, and water molds are not known to have any type of shell.

A Snail-Like, Coiled, Porous Test (Shell) of Calcium Carbonate Is