Which of the following pairs correctly represents biodegradable and non-biodegradable substances, respectively?
Paper – Plastic
Biodegradable substances are broken down by microorganisms; non-biodegradable ones are not.
Paper is biodegradable and plastic is non-biodegradable, so 'Paper – Plastic' is in the correct order.
'Metal – Food waste' and 'Plastic – Cotton' are the wrong way round.
Hence, the answer is Paper – Plastic.
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