wt is nitrification, dentrification and chemoautotrophs

Nitrification is a processes in which ammonia is converted into nitrite and then into nitrates by action of bacteria Nitrosomomas and Nitrobacter respectively.

Denitrification is the process of reduction of nitrates into nitrogen by bacteria like Pseudomonas and Thiobaccilus.

Chemoautotrophs are the microbes which synthesis their own food by using inorganic energy source like nitrifying bacteria such as Nitrobacter.