structural:expansion, linguistic:translation
Mesolithic

Europe was completely re-peopled during the Holocene climatic optimum from 9 to 5 thousand years ago. Mesolithic Western Hunter-Gatherers (WHG) contributed significantly to the present-day European genome, alongside Ancient North Eurasians (ANE) which descended from the Siberian Mal'ta–Buret' culture and Caucasus Hunter-Gatherers (CHG). Most present-day Europeans have a 40–60% WHG ratio, and the 8,000 year old Mesolithic Loschbour man seems to have had a similar genetic makeup. Near Eastern Neolithic farmers which split from the European hunter-gatherers about 40,000 years ago started to spread out across Europe by 8,000 years ago, ushering in the Neolithic with Early European Farmers (EEF). EEF contribute about 30% of ancestry to present-day Baltic populations, and up to 90% in present-day Mediterranean populations. The latter may have inherited WHG ancestry via EEF introgression. The Eastern Hunter-Gatherers (EHG) population identified around the steppes of the Urals also dispersed, and the Scandinavian Hunter-Gatherers appear to be a mix of WHG and EHG. Around 4,500 years ago, the immigration of the Yamnaya and Corded Ware cultures from the eastern steppes brought the Bronze Age, the Proto-Indo-European language, and more or less the present-day genetic makeup of Europeans.