我们知道,现在生活在非洲的主要是黑种人,在欧洲的主要是白种人,在亚洲的主要是黄种人。可是,这些不同人种的祖先出自何处呢?长期以来,学术界存在两种观点。一种叫做多地区起源说,认为远古时代的非洲、亚洲以及欧洲的某处,曾分别独自出现不同的类人猿,这些人类的祖先,在以后的洲际迁移中,互相交叉、混居、现代人的真正祖先则是这些不同类人猿杂交的产物。这种理论是科学家们分析研究世界各大洲丰富的人类化石证据,结合有关的遗传学理论而提出的。另一种叫做单一地区起源说,认为形形色色不同种族的现代人均出自非洲一个祖先。专家认为,大约在二百万年前,非洲大陆上出现了一种称为直立人的猿人,他们在以后的漫长岁月中,向地球的其它大陆迁移。而被称为现代人祖先的智人也是在非洲大陆诞生的。当智人向亚洲以及欧洲等地迁移后,便取代了那 We know that the main African-American people now living in Africa are primarily Caucasians in Europe and mostly in Asia. However, where do the ancestors of these different races come from? For a long time there were two views in academia. One origin, known as the multi-regional origin, said that in ancient times Africa, Asia and somewhere in Europe, different apes appeared on their own. The ancestors of these human beings crossed and mixed with each other in modern intercontinental migration True ancestry is the product of these different apes. This theory is scientists to analyze the rich continent of human fossils on all continents evidence, combined with the relevant genetic theory and put forward. The other, known as the origin of a single area, said that all modern people of all races and different ethnic origins come from an ancestor of Africa. Experts believe that about two million years ago, on the African continent, there appeared a kind of ape-man named Homo erectus, who migrated to the rest of the world in the long years that followed. Homo sapiens, known as modern ancestors, was also born on the continent of Africa. When the Homo sapiens moved to Asia and Europe, they replaced it