Nitrifying bacteria obtain their chemical energy from: a. the reduction of no3- to nh4+. b. the formation of nh4+ from n2 gas. c. the oxidation of nh4+ to n2.

C. the oxidation of NH4+ to N2.

Explanation:

Nitrifying bacteria are specific types of bacteria that obtain their chemical energy by the oxidation of inorganic nitrogen compounds. The process of nitrification can be divided into two steps:

a time line cause it goes from 685 to 978

answer; i believe the correct answer is (a)0