The feathery quality of the gills that give large surface area is necessary because they are supposed to be a kind of organ that is essential to fishes.
Without this, they won't be able to have their blood circulated or to even breathe. These gills are answerable for their blood to circulate and for the gas exchange, in charge for them to live.
Fishes respire through Gills. There are usually 4 to 7 pairs of Gills present in most fish species.
Thus, this is important for blood circulation.
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