A. 3 percent B. 10 percent C. 50 percent D. 75 percent 5. Some plastics, other man-made compounds 6. A. Dysentery B. Typhoid fever C. Cholera D. Malaria 7. The oceans B. Freshwater lakes C. Plants and trees D. Rivers and streams 8. D. Iron 10.
Water can exist as . . .
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