All trees do not give off fruits. The trees belonging to Gymnosperms produce seeds but no fruits.
They are born, they give off seeds which make little trees, which grow into big trees, which give off seeds... Trees can be used for firewoood.
All trees give oxygen; it is a result of the trees "inhaling" carbon dioxide. Just like how humans give off carbon dioxide when they exhale, trees also give off carbon dioxide. So all trees give off oxygen to the environment-its a natural result of trees trying to survive.
Technically, I believe we do need trees to live. As we give off carbon dioxide, the trees and plants give off oxygen. Without them, we would die. Trees also have many uses.
78percent
carbon and nitrogen
2%
carbon and nitrogen
carbon and nitrogen
carbon and nitrogen
carbon and nitrogen
Most leafy plants and trees give off oxygen