然後,研究人員認為,不同種類的智人開始出現。首先,他們的腿更長,更適合跑步和走路。然後他們的大腦開始發育。隨著這些早期人類開始捕獵和消耗更多的肉食性飲食,這些調整可能標誌著行為的改變。
對於大約70萬年前,被稱為海德堡人的物種起源於非洲和歐亞大陸。專家認為,這些古人類在外表上更像現代人,這為他們的後代如何進化奠定了基礎。他們的行為也與他們的前輩大不相同。
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