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In a Rock Pool, a Student Encounters an Organism with a Hard

Question 6

Multiple Choice

In a rock 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 mantle
B) a heart
C) a body cavity
D) a filter-feeding apparatus

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