Question

thiobacillus denitrificans is a species of bacteria that obtains its energy from carbon dioxide and inorganic compounds such as nitrogen in its environment. it is used in bioremediation (natural cleansing) of groundwater that contains excess nitrate, allowing the nitrates to be removed. through what process does thiobacillus denitrificans help bioremediate groundwater?
nitrification
denitrification
nitrogen fixation
decomposition

Explanation:

The bacterium is named Thiobacillus denitrificans, and denitrification is the microbial process that converts nitrates into nitrogen gas, removing excess nitrates from groundwater, which matches the described bioremediation function. Nitrification converts ammonia to nitrates, nitrogen fixation converts atmospheric nitrogen to usable forms, and decomposition breaks down organic matter, none of which remove nitrates in this way.

Answer:

B. denitrification