Answer:
(a) Oxygen in the air is essential for respiration and burning.
(b) Nitrogen dilutes the activity of oxygen in the air. Its compounds are very useful for the growth of plants.
(c) Carbon dioxide acts as a food for plants and in the regeneration of oxygen. It also helps in trapping heat radiations on earth.
(D) Water vapor controls climatic conditions and is very essential for the health and comfort of all living
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