Answer:
1. (c). air
2.(c).coal
3.(b).petrol
4.(c).cng
Explanation:
4.cng is one of the cleanest burning fuel available
1.air is is can not be exhausted by human activities
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Verified answer
Answer:
1. (c). air
2.(c).coal
3.(b).petrol
4.(c).cng
Explanation:
4.cng is one of the cleanest burning fuel available
1.air is is can not be exhausted by human activities