Question

C. Fill in the blank spaces in the following statements.
1. Air is a
mainly containing oxygen, nitrogen and argon
2. All living organisms need
for respiration.
3. The supporter of combustion in the air is
4. The gas formed during respiration is
5.
is the major source of pure oxygen in the biosphere.
N​

Answer 1

Answer:

1.mixture of gases

2.oxygen

Answer 2

Answer:

1. mixture of gases

2. oxygen

3. heat

4.co2

5. forest

not so sure