Question

how can we say that water contain air

Answer 1

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★彡 $\huge{\pink {ANSWER}}$ 彡★
Take out a bottle of soft drink from the refrigerator and place it on the table. You will see small drops of water appearing on the outer surface of the bottle. This is because water vapour present in the air condenses and forms small drops of water. This activity proves that air contains water vapour.
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Answer 2

The water is heating initially.then the air inside it boils and starts to escape in the form of bubbles

Water contains air dissolved in

and this air is the source of oxygen for the Animals living in water