Tag: evolution

Viral DNA: Photo courtesy of Amanda Mills via the CDC Biology Health 

Virus DNA in Humans: What’s in Your Genes?

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We all carry remnants of DNA from viruses that infected our ancestors millions of years ago. In fact, all mammals have virus DNA in their genes, but the human species has far less, according to a new study. Why? The reason could be that humans were exposed to fewer blood-borne viruses as we evolved to use tools, rather than our teeth for hunting and fighting. If you’re surprised to learn that we do have some virus DNA in our genes, don’t panic. It’s normal. Despite natural defense systems, a retrovirus…

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Oldest Primate: Scientists believe Purgatorius looked similar to Dryomomys szalayi, another primitive primate discovered near Yellowstone National Park by Jonathan Bloch. (Illustration courtesy of Doug Boyer) Biology Paleontology 

Oldest Primates Lived in Trees

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By Kate Stone A new study from the University of Florida suggests that humans’ earliest primate ancestor was a tree-dwelling creature. Named Purgatorius, scientists believe it looked like a cross between a squirrel and tree shrew, and weighed less than a deck of playing cards. This ancient animal was previously known only by its teeth. The shape of the teeth allowed paleontologists to determine the Purgatorius — estimated to have weighed about 3.5 ounces — ate insects and plants, but researchers knew little else about its lifestyle. With the discovery of…

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