Give reason:
Aquatic animals and plants are able to survive in water.
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Oxygen present in air is required for respiration by all living organisms. Aquatic plants and animals use the air (oxygen) dissolved in water for respiration.
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How is air useful to:
(a) water boats
(b) agriculture
(c) windmills
(d) scooters and cars?
What is the importance of dust particles present in air ?
A burning candle stops burning if covered with a glass tumbler.
Mountaineers and divers carry oxygen cylinders with them.