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Most plants get nitrogen from fertilizers. Some plants can have a process called nitrogen fixing in which nitrogen from the is turned into ammonium compounds. Animals get their nitrogen from food, by eating plants and other animals.
From plants or air.
Most of the nitrogen in your body is contained within proteins and most of the protein in your body is contained within the muscles.
nitrogen
Nitrogen is an absolutely essential part of amino acid structure, which makes up protein. Organisms are essentially "made" of protein, that is, the structure and function of their bodies is thanks to proteins. Nitrogen also has many other uses in the body such as the synthesis of non-protein nitrogen products (Nitric oxide, a vasodilator, and GABA, a neurotransmitter just to name a few.) But protein is definitely the most important function of Nitrogen. (Thanks to Jen for this answer!)
oxygen/nitrogen
nitrogen
nitrogen
Since 78.08% of the Earth's atmosphere is composed of nitrogen, yes. But it cannot be used in biological processes. The nitrogen animals use comes in the form of nitrogen compounds acquired from food. Ultimately, the nitrogen used by most living things is produced by nitrogen-fixing bacteria which do use nitrogen from the atmosphere, these compounds are then taken in and used by plants.
through roots from the soil
animals dont really need nitrogen but for plants, they need nitrogen and they get nitrogen usually in the form of nitrates or bacteria protein, by the work of nitrifying bacteria, putrefying bacteria and nitrogen fixing bacteria
Nitrogen- it makes up about 3% of the body.