Briefly classify the extinction processes.

Explanation

The extinction of species is a natural process. Many species have disappeared and new ones have evolved to take over their place. There are three types of extinction processes
(i) Natural extinction When there is change in environmental conditions, certain species disappear and other, (which are more adapted to changed conditions) take their place. This loss of species that occurred in the geological past at a very slow rate is known as natural extinction.
(ii) Mass extinction There have been several periods in the earth.s geological history when large number of species become extinct due to catastorphes. e.g. extinction of dinosaurs in end cretaceous period.
(iii) Anthropogenic extinctions Recently more number of species is disappearing from the face of the earth due to human activities. Man-made mass extinction represents a very severe depletion of biodeversity.