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When early humans arrived in Europe around 45,000 years ago,they found Neandertals already there.So they interbred 种繁衍)with them.Those interbreeding between Homo sapiens (and Neandertals happened more often than scientists had assumed.That's the conclusion of two new studies. Scientists analyzed ancient DNA from a tooth and two bone pieces.They were the remains of three people unearthed in the Bacho Kiro Cave in Bulgaria.The bones'owners lived 43,000 and 46,000 years ago.That makes them the oldest known human remains in Europe.Stone tools typical of late Stone Age humans were found in the same soil.With the DNA still inside the bone remains,scientists showed that Neandertals contributed about 3