Answer: Option (A)
Explanation: Extinction refers to the vanishing of any species or object, which are not going to reappear.
The human beings, because of their activities have raised the normal extinction rate upto 1000 times more. These activities are as follows-
- Burning up of fossil fuels, releasing huge mount of carbon into the atmosphere.
- Emitting a huge mount of toxic substances into the atmosphere, and causing various types of pollution such as air, noise, water and soil pollution.
- Over-grazing in the fields, over-fishing in the seas and oceans
- Using of various chemical fertilizers and pesticides and losing the fertility of the soil.
- Mining activities also are carried out.
All these above activities are equally responsible for causing damages to the environment and the existing ecosystem, where the different plant and animal species are harmed and are vanishing at a rapid rate.
Thus, the correct answer is option (A).