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Question
What is the problem associated with historical DNA samples?
Options:
A .  They are less in amount thus amplification is difficult
B .  Because the samples are very old, there can be contamination
C .  They degrade during repeated cooling and heating cycles
D .  As the samples are old, the standard sequences for comparison is not present
Answer: Option B
Answer: (b).Because the samples are very old, there can be contamination

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