Choose the correct option from the below about biodegradable substance: i) Bio degradable substances are easily decomposed by microorganisms and thus can easily mix into the soil again after a short interval of time. ii) They are not capable pf maintaining a good mechanical integrity unless its completely degraded. iii) They are non-toxic in nature. iv) All compostable is always biodegradable but all biodegradable is not compostable.

The correct option is iii) They are non-toxic in nature.

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