Which of the following is the most important cause for the extinction of animals and plants?

How many times have mass extinctions of species occurred since $3$ billion years ago to the present?

These are regarded as major causes of biodiversity loss:
$A$. Over-exploitation $B$. Co-extinction $C$. Mutation $D$. Habitat loss and fragmentation $E$. Migration
Choose the correct option:

Though the conflict between humans and wildlife started with the evolution of man,the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.

The primary cause for the extinction of wildlife is .........

Which of the following endangered animals is the source of the world's finest,lightest,warmest,and most expensive wool,known as Shahtoosh?