For what purposes does a person use plants?

Since ancient times, people have learned to use plants for their life purposes.
They were an important and early food source.

Then man did not yet know that plants, in addition, are capable of producing oxygen, without which life on earth would be impossible.

There are many medicinal plants among the plants. People have learned with their help to fight disease.

People build houses from processed tree trunks, make furniture, household items and dishes, musical instruments.