Question

The four elements that make up about 96% of body matter are ________.
a.nitrogen, hydrogen, calcium, sodium
b.sodium, potassium, hydrogen, oxygen
c.carbon, oxygen, hydrogen, nitrogen
d.carbon, oxygen, phosphorus, calcium

Answer 1

either b or c in my book bcuz hydrogen and oxygen have to be together to make water

Answer 2

An element is a pure substance that cannot be separated or divided into simpler substances by any method (physical or chemical). The four common elements in all the living organisms are carbon, oxygen, hydrogen, nitrogen.

Thus, the four elements that make up about 96 % of body matter are carbon, oxygen, hydrogen, nitrogen (c).