Humans impact the environment, and therefore, imact the normal cycling of matter that is constantly occuring around us.

Please select an example of human impact on matter (biogeochemical) cycles from those listed below.

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a
Huge factory farms with 1000s of animals in relatively small spaces producing large amounts of solid and gaseous waste.
b
Acid rain from the combustion of fossil fuels in automobiles and factories.
c
Groundwater depletion from over-pumping of aquifers for water demanding crops.
d
All of the above are examples of human impact on the biogeochemical cycles