Biodiversity is the variety of organisms within an ecosystem. The more biodiverse an area is, the healthier it generally is. For example, consider the trophic levels in a food web. If there is a high degree of biodiversity in the autotroph or plant level, the next level which is the herbivores would have a great variety of vegetation to consume. However, if man removes all the native plants in an ecosystem in order to farm, biodiversity will decrease and this in turn, may cause the death of some of the herbivores that depended on the native plants for food. The next trophic level, the carnivores can also be affected as their prey animals may become diminished or even extinct. Anytime biodiversity is adversely affected, it can affect any trophic level in a food web.