Question

2. Why is food essential for living organisms? (2) 3. Give reason why burning of candle is
irreversible change (1)
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Answer 1

Answer:

Absolutely for production of the energy and for survival

Answer 2

Answer:

food is essential for living organisms to perform several metabolic activity

when we burn candle we did not get again so it's is irreversible change but the melting of candle is reversible change