Answer :

The biological wealth of this planet is rapidly decreasing through human activities
and some the main causes are:-
1. Habitat Loss and Fragmentation – This is the important cause of animal and plants extinction. The most dramatic examples of habitat loss come from tropical rain forests. Once they were covering more than 14 percent of the land surface, and now days there only 6 percent left .it is exploited for natural resources like fibre , woods etc.
2. Over- exploitation - Humans have always depended on nature for food and shelter, but when needs turn to greed , it lead to over – exploitation of natural resources.Many species extinction is in last 500 years due to over exploitation.

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