In biology, "test" can refer to several different concepts depending on the context: 1. **Test (invertebrate structure)**: In the context of certain marine organisms, such as echinoderms and some protozoans, a "test" refers to a hard or protective outer covering or shell. For example, the tests of foraminifera are the shells made of calcium carbonate that these organisms use for protection and buoyancy in aquatic environments.
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