Question: Peer-Polity Interaction is a concept developed by John Cherry and another man that was born in what year?
Sentence (from "Colin Renfrew"): This hypothesis contradicted Marija Gimbutas's Kurgan hypothesis, which states that Proto-Indo-European was spread by a migration of peoples from the Pontic-Caspian steppe approximately 6,000 years ago.
Relevant evidence: No