一位动物学家对生活在非洲大草原奥兰治河两岸的羚羊群进行研究。他发现东岸羚羊群的繁殖能力比西岸羊群强,奔跑速度要比西岸的每分钟快13米,这些羚羊的生存环境和属类都是相同的,饲料来源也一样。于是,他在东西两岸各提了10只羚羊,把它们分别送往对岸。结果,运到东岸的10只一年后繁殖到14只,运到西岸的10只剩下3只。东岸的羚羊之所以强健,是因为在 A zoologist studied gazelles living on both sides of the Orange River in the savannah of Africa. He found that the eastern antelope herds multiplied more than the West Bank and ran 13 meters faster per minute than the West Bank. The living environment and genus of these antelopes are the same, and their sources of feed are the same. So he raised 10 antelopes on both east and west sides and sent them to the other side respectively. As a result, 10 of the 10 animals that had been transported to the East Bank breed to 14 after one year and the remaining 10 to the West Bank. The reason why the eastern antelope is strong is that