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atmosphere contains 78% free nitrogen (N2).
animals, including aquatic, animals need nitrogen to
produce proteins necessary for life.
though most of our atmosphere is nitrogen, animals cannot use
the nitrogen in this “free” form.
They must consume nitrogen by eating nitrogen compounds.
processes are involved in the Nitrogen Cycle: Nitrogen Fixation, Digestion,
Decomposition and Waste production (elimination)
nitrogen cycle shows how the free nitrogen in the air is turned
into nitrogen compounds and put into the soil by “nitrogen
fixing bacteria”. This
process is known as Nitrogen Fixation.
that soak up the nitrogen compounds in the soil are called legumes;
Oats, Peas, Beans, Corn (starchy vegetables).
eat the legumes to get the nitrogen compounds they need to produce
animals die, bacteria called decomposers break down the organic
matter (plants, animals) chemically into all the simple elements
that they are made of and these elements return back to the environment.
example: When an animal dies all
the carbon, oxygen, nitrogen, water, calcium etc. return to the
soil and air during decomposition.
an animal makes a bowel movement, the waste is loaded with nitrogen. This nitrogen returns to the soil. Nitrogen is a great fertilizer (Helps
plants to grow).