Dear student,
Three reasons for conservation of biodiversity:-
1. It is feeding us, Many crops like wheat, rice, vegetables, fruits and also some animals are the only source of our nutrition.
2. Some microorganisms and plants has medicinal value like penicillin (from the Pencillium fungi) for antibiotics, digitoxin (from common foxglove) for cardiac treatment, taxol (from the Pacific yew) for ovarian cancer, and quinine (from yellow cinchona) for malaria.
3. Landscapes, different types of plants and animals provide beauty and freshness to our earth.
Regards