Why is dna copying necessary during reproduction?

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• What is importance of dna copying in reproduction?
• Why dna copying is essential part of reproduction?
• What is dna copying state its importance?
• Why reproduction is necessary?
• What is reproduction why is it necessary?
• Is it necessary to carry hard copy of train ticket?
• What are the advantages of sexual reproduction over asexual reproduction?
• What is deep copy and shallow copy in javascript?
• What is the difference between shallow copy and deep copy?
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