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DNA sequence comparison is a powerful tool in studying evolution. However, there are limitations to what it can tell us about the history of life on Earth.

Which of the following is a limitation of this technology?


It is only possible to obtain DNA samples from extant or recently extinct species.


It is possible that an organism will have genes for non-functional proteins.


Mutations can occur randomly in genomes.


There is greater variation in DNA sequences that in amino acid sequences.

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