The biosphere (2)

4- Biodiversity loss : Extinction.

A species becomes ‘extinct’ when every single member of that species dies.

5- Causes of extinction. 

There are many natural causes of extinction, however humans are responsible for most of the recent loss of biodiversity in the world. 

Examples of destructive practices: climate change, hunting and capturing animals, alteration of habitats,  over-exploiting resources, pollution, releasing pets into the wild...

6- Effects of extinction.

Once a species is lost, it is no longer available to us as food, enjoyment,  as a resource for medicines and textiles among other things.

7-Protecting biodiversity

Endangered species are those which are in danger of extinction.

National parks and biosphere reserves are created to protect wildlife and its environment.