Chapter:

Environmental-Issues

Consider following statements regarding ecosystem which helps in reducing level of pollution in atmosphere.
. Ecosystems and ecological processes play an important role in maintenance of gaseous composition of atmosphere, breakdown of wastes and removal of pollutants.
. Some ecosystems, especially wetlands have ability to breaking down and absorb pollutants.
. Natural and artificial wetlands are being used to filter effluents to remove nutrients, heavy metals, suspended solids; reduce BOD (Biological Oxygen Demand) and destroy harmful micro-organisms.
Which of statements given is/are correct?