12)Net primary productivity  group of answer choices a)is the rate at which producers manufacture chemical energy by photosynthesis minus the energy used in respiration b)is the rate at which producers use chemical energy through respiration. c)is the rate at which producers manufacture chemical energy through photosynthesis. d)is the rate at which producers manufacture chemical energy by respiration minus the energy used in photosynthesis e)relates to how many cars can be made per hour on an assembly line

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Air Pollution

The excess accumulation of pollutants or undesirable alterations in the environment and its resources such as air, water, and land can be referred to as pollution. Pollution affects the components of the environment. Pollution is considered a global issue as it is showing harmful effects worldwide. Metropolitan cities are more impacted by pollution than countryside or villages.