Conversion of nitrogen into a useable form is known as

Nitrogen is converted from atmospheric nitrogen into forms, such as NO2-, in a process called fixation. The majority of nitrogen is fixed by bacteria, a lot of which are symbiotic with plants.

Fixation

i think the answer would be d

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.