It is better for the sake of evolution to allow creatures to go extinct.
为了进化,最好让生物灭绝。
With all that attention paid to them, you'd think these creatures would at least have the gratitude not to go extinct.
人们对这些生物如此关注,你可能会想,它们没有灭绝至少应该心存感激。
Why do certain species go extinct?
为何存在某一种类灭绝?
Some of them get reinforced and those are the ones that survive and others don't get reinforced and those are the ones that go extinct.
一些行为得到了强化,因而保存了下来,另一些行为则并未得到强化,不再出现。
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