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Why are some substances bio- degradable ...

Why are some substances bio- degradable and some non-biodegradable?

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Some substances such as paper, vegetables, peels, etc. are acted upon by decomposers and get converted into simple form are called biodegradable. Biodegradable substances are natural substances.
Some synthetic substances such as plastic, polythene, etc. cannot be degraded by microbial actiVity are called non-biodegradable.
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