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Plants produce oxygen (O2).
The combination of the center of atoms to produce a heavier element is called nuclear fusion.
Not normally.
CO2
A chemical reaction took place creating a new element.
Calcium is an element. It's an alkaline earth metal, if that helps.
The mitochondria copiously produce Atp which is required in all Cellular functions including the contractile activity of muscle tissue.
the Sun
radiation
Carbon is the most abundant element on earth.
it must be a 5+ ion of element nitrogen and it is very difficult to produce.