Which of the Following Statements Best Describes the Impact of Human

Multiple Choice

Which of the following statements best describes the impact of human activities on the cycling of nutrients in natural systems?

A) Human activities are essentially benign and have little lasting impact on either atmospheric or sedimentary nutrient cycling.
B) Human activities have profoundly affected nutrient cycling, particularly with those nutrients that cycle within the atmosphere.
C) Human activities such as mining, construction, and road building disrupt the Earth's surface and greatly decrease those nutrients with sedimentary cycling pathways.
D) Human activities in general significantly enhance nutrient availability and are almost always associated with ecosystem improvements.