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Which two elements make up the most
common compound in the human body?

A. C and H
B. N and O
C. H and O
D. P and Ca​


Sagot :

Answer:

C. H and O

Explanation:

Almost 99% of the human body's mass is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus, in that order.

Element   Symbol   % in body

Oxygen       O              65.0

Coal             C               18.5

The human body is composed of 60% water, that is, H2O.