Which of the following have biologists used in an attempt to understand the phylogenetic relationships among organisms?

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Biologists have used all three methods (examining DNA sequences, comparing morphological features, and examining the fossil record) to try to understand the evolutionary history and phylogenetic relationships of different organisms. DNA sequences can provide information about the similarities and differences in the genetic code of different organisms, while comparing morphological features (such as the structure of bones, organs, or other physical characteristics) can reveal similarities or differences in body plans or other traits. The fossil record can help scientists understand how organisms have changed and evolved over time and can provide important information about the history of life on Earth.

Which of the Following Have Biologists Used in an Attempt