What organisms are involved in the nitrogen cycle?

Question

please help me im struggleing.

Answer 1

Most nitrogen is found in the atmosphere.

Nitrogen is removed from the atmosphere by lightening and nitrogen fixing BACTERIA. During electrical storms, large amounts of nitrogen are oxidized and united with water to produce an acid which is carried to the earth in rain producing nitrates. Nitrates are taken up by PLANTS and are converted to proteins.

          Then the nitrogen passes through the food chain from plants to HERBIVORES to CARNIVORES. When plants and animals eventually die, the nitrogen compounds are broken down giving ammonia (ammonification). Some of the ammonia is taken up by the plants; some is dissolved in water or held in the soil where bacteria convert it to nitrates (nitrification). Nitrates may be stored in humus or leached from the soil and carried to lakes and streams. It may also be converted to free nitrogen (denitrification) and returned to the atmosphere.

Answer 2

nitrogen fixing bacteria can turn atmospheric nitrogen (N2) into a form usable by all living things (ammonia; NH3). Likewise, some plants can convert nitrates and nitrites into ammonia. Once formed, ammonia can be used by all living things to make proteins and nucleic acids.