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ivann1987 [24]
3 years ago
14

Flow

Biology
1 answer:
natka813 [3]3 years ago
6 0

Answer:

Fish utilise a counter-current system in order to maximise the amount of oxygen that can extracted from water. Water has a much lower oxygen content than air and as such fish need a much more efficient system that can extract a much higher proportion of oxygen from the surrounding water.

Explanation:

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