Question

thin
air pollution
Oxygen
respiration
CNG
1. A fire cannot be lighted if there is no
2. The air becomes
as we go up
3. We should encourage people to use
in vehicles to minimise
air pollution
4. The food we eat produces energy through the process of
5. We should plant more and more trees to avoid​

Answer 1

Answer:

1.oxygen

2.thin

3.CNG

4.respiration

5.air pollution