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growth of baby into adult is a physical or chemical change ? please reply fast

A chemical change is a change in which something new is formed (irreversible). The starting materials change into an entirely different substance or substances. This new substance has a different chemical composition than the starting materials. 
Here also growth of baby into adult is a chemical change as adult can not be changed back into the baby. 

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It is a chemical change as an adult cannot be turned back into a baby, and nor even an old man can be changed into a young man.the process of the life cycle is a chemical change and is irreversible...

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It is a chemical change because a young man cannot be returned to a baby.

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It is a chemical change because a grown up man cannot be changed to a child.

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