His constant attempts to（）his colleagues’ achievement eventually caused his dismissal.

A. Interferon has serious side effects, whereas antibiotics do not.
B. Interferon is available in large supply, whereas antibiotics are not.
C. Antibiotics are very effective, while interferon is not.
D. Antibiotics kill germs by attacking them directly, while interferon does not.

A. where the atmosphere meets the sea
B. in which birds, fish and animals would die
C. in which plant and animal life can exist
D. in which earthworms and other invertebrates can live