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Why are some substances biodegrable and ...

Why are some substances biodegrable and some non- biodegradable?

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Substances that are broken down into simple and harmess substances by biological processes are called biodegradable substances.
Example : Domestic wastes sewage cowdung etc .
(ii) Substances that are not broken down into simple and harmless substance are called non-biodegradable substances.
Example: Plastics, polythene bags insecticides like DDT etc
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