With which archaic human species did some of the ancestors of modern europeans interbreed during the past 100,000 years

Homo erectus presumably evolved into Homo heidelbergensis, so the two species cover different time periods as well. Homo erectus lived from about 1.9 million years ago to about 800,000 years ago, whereas Homo heidelbergensis lived from about 800,000 years ago to as recently as 100,000 years ago

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i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

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answer: c

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