Answers

2015-10-24T19:03:53+05:30
Biodegradable substances are those substances which decomposes by the action of micro-organisms. e.g.:- vegetable peel,tea, leaves.
Non biodegradable substances are those substances which do not decomposes by the action of micro-organisms. e.g.:- plastic bottle,plastic bags, glasses.
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2015-10-24T23:33:46+05:30
By using 3Rs principle.
they are
reduce
reuse
recycle
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