Bacteria Archea Virus And Their Broad Classification

Moritella, a bacterium, lives at 10,000 m depth under pressure of 700 - 800 atm in the oceans. The bacterium is an example -

Which of the following bacteria are involved in denitrification process ?
A. Nitrosomonas
B. Bacillus
C. Pseudomonas
D. Nitrobacter
Choose the correct answer from the options given below :

Bacterial oxidation of pysite (FeS₂) results in an environmental concern called