Fragments of DNA extracted from the remnants of extinct woolly mammoths can be used to better understand evolutionary relationships among members of related taxa. So the correct option is D.
All the complex organisms present on earth today have evolved from a common ancestor. The relationships among organisms are observed while studying the structural and functional similarities or by understanding the similarities of their genetic sequences.
This kind of relationship among organisms is called an evolutionary relationship. Thus fragments of DNA extracted from woolly mammoths can also be used for a better understanding of evolutionary relationships among members of the related taxa.
Therefore the correct option is D.
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