Question

Forests provide that plays an important role for the survival of human beings.

• A. oxygen
• B. nitrogen
• C. hydrogen

Answer 1

The correct option is A oxygen

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Forests are known as the lungs of the earth as they help in maintaining an ecological balance between oxygen and carbon dioxide.
Trees take in carbon dioxide and give out oxygen. Human beings inhale oxygen and exhale carbon dioxide.
Thus, forests play an important role for the survival of human beings.