Question

Make sentences using the given set of words.

(a) 99%, oxygen, nitrogen, air, together

(b) Respiration, dissolved, animals, air, aquatic

(c) Air, wind, motion, called

Answer 1

(a) Oxygen and nitrogen together make 99% of air.

1. Nitrogen is the most abundant gas on the planet.
2. It makes up 78% of the total atmosphere.
3. Oxygen is the second most abundant gas constituting 21% of the atmosphere.
4. Together, they make up 99% of the air.

(b) Aquatic plants and animals use dissolved air for respiration.

1. Respiration is a fundamental biochemical process that occurs within the cells of all organisms.
2. Water contains dissolved oxygen and carbon dioxide.
3. Dissolved oxygen is used by aquatic organisms for their respiration.

(c) Air in motion is called wind.

1. The movement of air is caused by differences in pressure and temperature.
2. Warm air being lighter, moves upwards while cold air being heavier, moves downwards.
3. This creates moving air called wind.