To make amino acids and in DNA formation
Certain plants are nitrogen fixers. Alfalfa is one.
The carbon cycle and nitrogen cycle are related due to both plants and mammals using them. Plants take both carbon and nitrogen in and convert them to sugars and proteins that humans eat when eating the plants.
Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals.
All mammals use internal fertilization.
Then Nitrogen you inhale has no use. But nitrogen, from other sources, such as food, helps sperm production.
All mammals use lungs to breath.
whales and dolphins are both mammals that use waterways.
Plants use nitrogen a N- and air has N2. Nitrogen fixation changes nitrogen into a form that plants can use.
Urea is a soluble form of nitrogen waste produced in the liver from ammonia. It is the primary nitrogenous waste product in mammals and most terrestrial animals.
Nitrogen is very important in fertilisers.
During nitrogen fixation, nitrogen gas is converted into ammonia or other forms of usable nitrogen by nitrogen-fixing bacteria. This process is important because plants and other organisms cannot use atmospheric nitrogen directly in this form.
the answer is "nitrogen fixation" because nitrogen fixation is The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes.Read more: nitrogen-fixation