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15/12/2020 5:55 pm
Topic starter
Fill in the Blanks
1. 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 are called …….. wastes.
2. The waste materials which can not be broken down into harmless substances in nature are called …….. .
3. …….. is the ultimate source of energy.
1 Answer
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15/12/2020 5:55 pm
1. biodegradable
2. non-biodegradable wastes
3. Sun