Nitrogen and oxygen make up about 99%of the atmosphere. I'm not sure if it will help! But thats all I know.
Here you need to put if you have any questions about the material you are learning. If you have none i would consider putting that you have none.
Answer:
Donations should be encouraged to help needy peoples and build a better society. Donations also show the kidness of individual. Donating small amount also may save someones life and health. This is why donations should be encouraged to save the society.
