8. A, B and C are the components of air. Gases
A and B dissolve in water while gas C does
not dissolve in water. Gas A dissolved in water
is used by aquatic animals in photosynthesis
and gas B is used by aquatic animals for
respiration. Gas C is the major component of
air. Identify the gases A, B and C.
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Answer:
Aquatic animals use oxygen gas dissolved in water to respire.
The oxygen dissolve in marine water by diffusion from the surrounding air; aeration of water that has tumbled over falls and rapids; and as a waste product of photosynthesis. This dissolved oxygen is then used by marine animals for respiration
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