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The World Around Us!
Fist respiratory system exchanges oxygen and carbon dioxide the their environment. They do not breathe through their nostrils. Gills on the other hand have a large surface area. Each of the two gills have 4 gill arches. One part of the gill arches is the gill rakes which filters out food from the gills. Gill filaments also makes the 4 gill arches.
(Above) Fish gills.
(below) inside a sharks mouth
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