In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Our beautiful ecosystem is being systematically (1)_______ by industrial pollution channelled into rivers like the Ganga and the Yamuna, nuclear wastes from atomic plants muted into the world's oceans, and (2)______ gases such as carbon dioxide mixed with the ozonosphere. Besides, tropical rainforests and green pastures are disappearing (3)______ the pressure of a proliferating population. Dams are being (4)_______ over the rivers like the Narmada to change nature's well-balanced surface equations between flora and fauna, and sloping mountainous terrain is being converted into mini oceans to supply electricity to the ever-starving industrial stomach of our age. Elephants, tigers, the wild rhinos of South Africa and many other forest creatures have become (5)_____ species.