Answers

2015-07-25T12:23:00+05:30
Oxygen is very important for respiration purpose . even aquatic animals need oxygen for their respiration . but every time they can't come out of the water and breathe . H2O is water . so there is oxygen (o) in the water . this oxygen present in the water will be in dissolved form .That's y the aquatic animals can breathe inside the water . So it is essential for the aquatic animals to breathe.
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