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有位动物学家对生活在非洲奥兰治河两岸的动物考察中，发现一个十分奇怪的现象：生活在河东岸的羚羊繁殖能力比西岸强，并且它们的奔跑能力也大不一样，东岸的羚羊奔跑速度每分钟要比西岸的羚羊快13米。对这些差别，动物学家百思不得其解。因为羚羊的生存环境和食物都相同。在?
A zoologist on an expedition to the two sides of the Orange River in Africa found a very strange phenomenon: Antelopes living on the east bank of the river have a much stronger breeding ability than the West Bank and their ability to run is also very different. The east coast Antelope runs 13 meters faster per minute than the antelopes in the West Bank. Zoologists baffled these differences. Because the antelopes living environment and food are the same. in?