Question

29. What is the main constituent of the atmosphere at
ground level?
4) Water
(B) Oxygen
(C) Nitrogen
(D) Carbon dioxide
30. Why is ethanol used in preference to water as the main
ingredient of perfume?
Ethanol is cheaper to produce.
(B) Ethanol has no detectable odour.
(C) Ethanol dissolves esters more readily.
(D) Ethanol has a significantly lower density.​

Answer 1

Answer:

nitogen,c option.........

Answer 2

Explanation:

water is your answer of 29 question