Nature is severely weeding out the weak speices through the 'survival of the fittest', and at the same time humans have also reduced animal populations through hunting and poaching.
(好吧,写作5.5分)
让我们看看考官是怎么写的:
Survival of the fittest is nature's way of ruthlessly allowing weaker specimens to die out. Meanwhile, mankind has also contributed to falling animal numbers through hunting and poaching.