The element Carbon is a main material in sugars,
proteins and fats.
Carbon compounds are found in vitamins and in
waste like carbon dioxide and urea.
The carbon cycle describes how many processes fit
together to form a cycle in which carbon atoms are
used over and over again.
Animals obtain their nitrogen from plants and other
animals.
Plants obtain their nitrogen intake from nitrates since
nitrogen is fairly un-reactive. These nitrates are
usually absorbs by plants through their roots.
The nitrogen cycle describes how many processes fit
together to form a cycle in which nitrogen atoms are
used over and over again.