Many Protists Have Shells of Calcium Carbonate Called _____

Question

Many protists have shells of calcium carbonate called _____.
A)exoskeletons
B)carapaces
C)tests
D)plastrons

Accepted Answer

The term "tests" refers specifically to the shells of calcium carbonate that many protists, such as foraminifera and radiolarians, have. "Exoskeletons" and "carapaces" are more commonly used to describe the protective outer coverings of arthropods and crustaceans, while "plastrons" are specialized respiratory structures found in some aquatic insects.