How does movement of the legs affect the gills of crabs?
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The beating or fanning movements of three pairs of maxilliped flagella in crabs and crayfish modify exhalent gill currents while drawing water over chemoreceptors on the head. They play an integral part both in signalling by distributing urine odours, and in active chemosensation.

Explanation:

answer; i believe that the correct answer is (lung);