a large traction of the chemical elements that occur naturally on the earth surface are essentialtothestructureandmetabolismoflivingthings.Four of these elements ( hydrogen,carbon, nitrogen,and oxygen) are essential every living thing and collectively make up 99% of the mass of protoplasm.
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Answer:
a large traction of the chemical elements that occur naturally on the earth surface are essential to the structure and metabolism of living things.Four of these elements ( hydrogen,carbon, nitrogen,and oxygen) are essential every living thing and collectively make up 99% of the mass of protoplasm.
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