Biodiversity is the diversity , the variety of life on Earth. It is diversity of animal and plant species. The value of biodiversity can be indirect and direct.
The direct value include food resources from plants and animals, medicines, fuel, wool,...
Indirect values of biodiversity on the other hand support the existence of biological life and other benefits which are difficult to quantify. These include social and cultural values, ethical values, aesthetic values, option values and environment service values.