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Q.

The source of oxygen for aquatic animals is ________.

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a

Soil

b

Land

c

Air

d

Water

answer is D.

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Detailed Solution

The source of oxygen for aquatic animals is water.

Aquatic animals consume dissolve oxygen. This oxygen is available in water through two processes-

Diffusion from the atmosphere: When air comes in contact with water bodies, the oxygen is diffused from higher concentrations to lower concentrations.
Aquatic plants: Aquatic plants also consume carbon dioxide (produced by aquatic animals) and produce oxygen gas which is dissolved in water.

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