Dissolved oxygen is added to streams and rivers by
A) aerobic bacteria.
B) waterfalls and rapids.
C) decaying algae.
D) fertilizer runoff.
Correct Answer:
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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
Q20: What percentage of water on the earth
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
Q26: Which company's industrial waste water would have
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