Answer:
(a)
Depletion of ozone is mainly due to chlorofluorocarbons (CFCs). These are
synthetic chemicals which are used as refrigerants and in fire extinguishers.
Carbon monoxide leads to air pollution. It causes harm to humans by
combining with hemoglobin, thus affecting Og carrying capacity of blood.
Methane is a greenhouse gas, released from power stations,
chemical industries etc.
Pesticides are not degradable, thus causes biological magnification.
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