Compare and contrast indirect versus direct values of biodiversity, and provide examples

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.

The result shows that one can be conditioned by experience to have aversion for some food. 
In the study of taste aversion, the rats that are shocked during exposure to light and clicker developed aversion for light and clicker sound. 
Those rats that were nauseated as a result of sweetened water developed aversion for sweetened water.