Humans are particularly adept at water transformation; scientists now estimate that human activities have affected nearly ________ percent of the world's rivers.
A) 10
B) 40
C) 70
D) 100
Correct Answer:
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Q12: If all bacteria were suddenly unable to
Q13: An increase in POP concentrations in higher
Q14: Which of the following statements about bioaccumulation
Q15: Some chemicals and heavy metals bioaccumulate readily
Q16: Skin cancer is caused by exposure to
Q18: Loss of biodiversity is an example of
A)
Q19: The release of chlorofluorocarbons (CFCs)into the atmosphere
Q20: Carbon dioxide makes up approximately _ percent
Q21: The addition of carbon dioxide to Earth's
Q22: Which of the following statements describes a
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