What percentage of water on the earth is fresh water?
A) 2%
B) 25%
C) 45%
D) 98%
Correct Answer:
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Q15: A characteristic of a lake dying from
Q16: Which of the following is NOT a
Q17: _ million people on earth do not
Q18: What percentage of water on the earth
Q19: The saltiness of the oceans is
A)decreasing slowly.
B)increasing
Q21: Dissolved oxygen is added to streams and
Q22: Aerobic decomposition of organic matter requires
A)oxygen.
B)nitrogen.
C)magnesium.
D)water.
Q23: Pathogenic is
A)disease-causing.
B)an antibiotic.
C)a cure for a disease.
D)a
Q24: Anaerobic degradation of organic material in water
Q25: Which part of the water supply is
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