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The two strands of dna are different .they consists of phospane sugar hydrogen bonds and adinine,gwanine,thimine and cytocin.adinine form hydrogen bond with thimine and gwanine form bond with cytocin.hence the two strands of dna are not identical but are complimentry.(for reference see 10th class biology t.b)
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No two strands of DNA are identical because the chemical bonds are arranged alternatively without repetition............
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