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stepladder [879]
2 years ago
15

CHAPTER ONE THE CHEMICAL COMPONENTS OF THE CELL Biology Form Three Student Book

Biology
1 answer:
Dmitriy789 [7]2 years ago
7 0
1. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
2. The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you.
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