Extinction can leads to various adverse effect on the environment. The current rate of extinction is higher than former extinction rates.
What does extinction means?
Extinction is the termination of the species due to various underlining factors.
It is also considered as the death of last individual of a given species.
In current extinction rates are much higher than background rates and rates from previous mass extinctions.
Along with this, many species are in danger or on verge of extinction.
Thus, the correct option is C.
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