Question

Why is the area under virgin vegetation decreasing slowly?

Answer 1

Because
Expansion of railway
Minnig
Deforestation
Construction of dam

Answer 2

$Assalamualaikum$

Here is your answer....,

Virgin vegetation refers to an area of vegetation which have been left undisturbed by human being but now a days mostly all the places have been occupied by human either for living or wandering so this could be the reason for the virgin vegetation are decreasing day by day.

I hope it will help you and mark me as a brain list answer plz.