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    Discuss with reference to Prokaryotes, the reasons why classification systems are not universally accepted and why they change over time
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    Because stuff happen.
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    Its because in prokaryotes horizontal gene transfer occurs. In other words DNA can be passed between different species via pili rather than going through daughter cells like the eukaryotes.
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    http://en.wikipedia.org/wiki/Horizontal_gene_transfer
    this might help you.
 
 
 
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