结构推理 Wherever they are now, black people are descended from Africans, but over the centuries their genetic heritage has become diversified and complicated because of various reasons.
【正确答案】不管现在身处何地，黑人都是非洲人的后裔，但是数百年来，由于种种原因，他们的遗传基因已经变得多样化且非常复杂。
【答案解析】