Question

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Define gills ÷​

Answer 1

Answer:

the paired respiratory organ of fish and some amphibians, by which oxygen is extracted from water flowing over surfaces within or attached to the walls of the pharynx.

Answer 2

Answer:

Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries. As the fish opens its mouth, water runs over the gills, and blood in the capillaries picks up oxygen that's dissolved in the water.

Explanation:

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