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In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which of the following structures would allow for the most certain identification of the organism?
a.a heart
b.a filter-feeding apparatus
c.a mantle
d.a body cavity
e.eyes

Answer :

luisvaschetto

The presence of a MANTLE would allow for the most certain identification of the organism (Option C).

Lobsters, shrimps, crabs and barnacles are crustaceans (phylum Arthropoda), while bivalves are mollusks (phylum Mollusca).

The mantle, also known as pallium, is a soft covering formed from the body wall in brachiopods and mollusks.

In mollusks, the mantle secretes an organic matrix that mineralizes in order to form the shell.

In bivalves, this structure (i.e., the mantle) is composed of two lobes that enclose the animal within the shell.

Arthropods have no mantle, instead, they have exoskeletons that contain and protect their internal organs.

In conclusion, the presence of a MANTLE would allow for the most certain identification of the organism (Option C).

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