Which of them are bio-degradable waste?

Cow dung

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Animal bones

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Paper

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All of them

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Solution

The correct option is D All of them
Those waste materials which can be broken down to non-poisonous substances in nature in due course of time by the action of micro-organisms like certain bacteria, are called biodegradable waste.
Cattle dung and compost are common examples of biodegradable waste. Other examples are animal bones, leather, tea leaves, wool, paper and wheat.

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