Answer:
They learned that the DNA found in early humans can be found in today's humans.
Explanation:
Ötzi is a well-preserved mummy found in the Italian-Austrian border in 1991. Ötzi was a hunter-gatherer, who, according to scientifc analysis, lived around 5,000 years ago.
DNA analysis showed that Ötzi is essentially like a modern human from the past, albeit a bit shorter than the average male from either Austria or Italy. There are no significant differences between Ötzi's DNA and that of a modern human.