Which organisms are prokaryotes a. archaea b. fungi c. protist d. plants

The best answer is A.

Archaea  are primitive micro organisms that have one cell and live in environments that are severe, such as those that are extremely salty or hot.

They are any of a group of single celled prokaryotic organisms that have distinct molecular characteristics separating them from bacteria and from eukaryotes.

An example of such is Pyrolobus  fumarii which is found living in hydrothermal vents in  temperatures of upto 235 degress Fahrenheit. They are also known to  grow at pH 0. an extremely acidic environment.

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.