There are two main types of sources of water pollution; point source pollution and nonpoint source pollution
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O True
O False
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Ответ:
By mass, oxygen is the most abundant element in the human body
Explanation:
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