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The passage given below is followed by four alternative summaries. Choose the option that best captures the essence of the passage. Genetic evidence from a finger bone found in a Siberian cave has unveiled a new, extinct human species known as the Denisovans. These hominins coexisted with both Neanderthals and early modern humans, and their DNA is a fascinating puzzle piece in the human evolutionary story. Studies show that a significant portion of the Denisovan genome persists today in the populations of East and Southeast Asia, as well as among Indigenous Australians and Melanesians. This suggests that modern humans interbred with Denisovans as they migrated out of Africa, a finding that radically changed our understanding of human migration and the notion of a single, linear human family tree. The genetic legacy of Denisovans is not just a relic; it is believed to have provided key genes that helped modern humans adapt to new environments, such as a gene variant for high-altitude survival found in modern Tibetans.