Final answer:
The Woolly Mammoth, Giant Ground Sloth, and Saber-toothed Cat are three extinct mammal species that have had their ancient genomes characterized.
Step-by-step explanation:
Three extinct mammal species that have had their ancient genomes characterized are:
- Woolly Mammoth: Scientists have sequenced at least 50 percent of its genome and believe mammoths are between 98 and 99 percent identical to modern elephants.
- Giant Ground Sloth: The ancient DNA of this extinct sloth species has provided insights into its evolutionary history and adaptations.
- Saber-toothed Cat: Analysis of ancient DNA has revealed information about the genetics and phylogenetic relationships of this fascinating extinct predator.