Nitrogen starts in soil and becomes useful nitrogen for plants and it gets passed on to animals. Decomposers would eat nitrogen-rich dead organisms and some of the nitrogen goes back into the soil.
Air/gas animals and humans breathe in, and a little bit of nitrogen is included in the air it has just breathed in.
Plants and animals die and decomposers break down their nitrogen containing molecules to ammonia. All animals get the nitrogen they need by eating plants, by eating other animals that ate plants, or by eating animals that ate animals that ate plants.
by Bacteria.
Animals use nitrogen to build proteins in their bodies. Nitrogen is a vital component of amino acids, which are the building blocks of proteins essential for growth, maintenance, and repair of tissues in animals.
Animals and plants need nitrogen to live because proteins and other biological compounds contain nitrogen. In plants, nitrogen compounds perform photosynthesis. In humans, nitrogen is the basis for amino acids, the building blocks of genetic material.
Much like humans, animals go through a process of metabolic waste to rid themselves of the toxins in their system. Some of the chemicals animals get rid of include nitrogen, phosphates, sulfates, water, and uric acid.
no plants and animals cannot use nitrogen straight out of the air every time we take a breath you breath it in but it goes through nitrogen fixation to let us humans animals and plants to use it.
Animals get nitrogen from plants.
Amino acids, proteins and DNA.
Plants get the nitrogen they need to make proteins and DNA by absorbing it from the soil through their roots in the form of nitrates or ammonium. Animals, including humans, obtain nitrogen by consuming plants or other animals that have already assimilated nitrogen into their bodies. This nitrogen is then used to synthesize proteins and nucleic acids in our cells.
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.
Animals will lose nitrogen when they die. This is whey decay and nitrogen is released as ammonia into the air.