What do you understand by biodiversity? How can you say variations are present in them?

Diversity means a variety.Biodiversity means biological variety.It refers to the variety of organism(plants,animals and micro-organism) found in a particular area or habitat or

the presence of a large number of organism found in a particular area is called biodiversity.

Variations are present in biodiversity at various levels to understand that biodiversity. Every species is linked with a multitude of others in an ecosystem. All animals are part of food webs that include plants and animals of other species. Minor disruptions in a particular ecosystem tend to lead to changes that eventually restore the system. But large disturbances of living populations or their environments may result in irreversible changes.