Answer:2,5,6
Explanation:
1) The most abundant gas in atmosphere is Nitrogen .
2) plants make their food from Carbon dioxide in presence of sunlight and give oxygen
3) troposphere is the lowest region of atmosphere. Chunks of rock from space are burnt in Mesosphere (50 to 80 km above earth surface)
4) Stratosphere lies 12 to 50 km above earth surface.
5) the troposphere gets colder the higher you go.
6) The ozone in the stratosphere protects us from ultraviolet radiation.
7) troposphere contains nearly 75% of water vapor of atmosphere and it is not constant
