How do humans get nitrogen we need to make proteins and dna if we can't get it from breathing?

Answer 1

Humans and most other living things are unable to use nitrogen from the atmosphere in their metabolism. The only living things able to use nitrogen from the atmosphere in their metabolism are a small number of species of anaerobic nitrogen fixing bacteria. Several species of nitrogen fixing bacteria are symbiotic with legume plants, the bacteria provide the legume with fixed nitrogen, the legume provides the bacteria isolation from the poisonous oxygen in the air as well as carbohydrates as food.

Humans as all other animals, get their fixed nitrogen by eating other animals and/or plants.

Answer 2

you consume (eat) it in the form of proteins. Digestion breaks down these into amino acids and your body uses these to form new proteins and DNA for cell division. You cannot use elemental nitrogen.

Answer 3

Humans obtain nitrogen through the consumption of protein-rich foods, such as meat, fish, dairy, legumes, and nuts. These foods contain amino acids, the building blocks of proteins, which are essential for DNA synthesis and various cellular functions. While nitrogen is present in the air we breathe, our bodies cannot utilize atmospheric nitrogen directly; instead, we must rely on dietary sources to meet our nitrogen needs.

Answer 4

They eat nitrogen compounds in plants.