Please answer 69 question

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Dear student.

Reason is the correct explanation of Assertion.

The countercurrent flow is an adaptation seen in organisms such as fishes which have very high metabolic rates. The principle of this adaptation is to optimize the O2 uptake from water or to facilitate diffusion of carbon dioxide and oxygen. Gills present in fishes as respiratory organs are the outgrowths which contain blood vessels and are covered by a thin layer of epithelial cells. The countercurrent flow takes place across a gill lamella in a fish.


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