The correct options are
A Provide oxygen
B Provide habitat to animals
C Source of medicinal plants
∙ Forest plays an important role in the survival of life on the Earth.
∙ The trees in forest absorb the carbon dioxide gas released by animals and give out oxygen which is required for the existence of life.
∙ They provide a natural habitat to a large number of species. It provides them with food, shelter, oxygen etc. Forests are also a good source of medicinal plants.