(a) We do not clean ponds or lakes but an aquarium needs to be cleaned. Why?
(b) Why is improper disposal of wastes a curse to environment?
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Explanation:
a. Ponds donot needed to be cleaned but aquarium needs to be cleaned. This isbecause aquarium do not contain soil and decomposing bacteria which helps in degrading complex organic substance into simple inorganic substance and act as a cleaner
b. Improper disposal of waste is a curse to environment because it pollutes theenvironment, air, water, soil and cause harmful effects on living organisms. For example, passage of sewage into water body cause eutrophication, killing of animals and source of water-borne pathogens.
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