Nitrogen can be converted to both biological and chemical ways. Why is nitrification an important process? 1. Bacteria converts ammonia into nitrites and nitrates that plants can use. 2. Fungi convert nitrogen in dead plants into ammonium which converts proteins into ammonia. 3. Nitrogen is converted into a usable form through lightning fixation. 4. Plant enzymes reduce nitrogen compounds into amino acids.

it is option A

Explanation: nitrification, is the process by which bacteria in the soil convert ammonia to nitrites and nitrates. Ammonia (NH3) was produced by nitrogen fixation, but plants prefer nitrites and nitrates as a source of nitrogen and oxygen.

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i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.