When the candle was lighted, it melted into a liquid and became solid again after few seconds or in a minute. What causes these changes? I. presence of heat II. presence of oxygen III. absence of heat IV. absence of oxygen
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When the candle was lighted, it melted into a liquid and became solid again after few seconds or in a minute. What causes these changes? I. presence of heat II. presence of oxygen III. absence of heat IV. absence of oxygen
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Explanation:
II. presence of oxygen and III. absence of heat po, yes