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适者存活高中英语作文

   日期:2020-08-04     来源:www.zhixueshuo.com    作者:智学网    浏览:320    评论:0    
核心提示:适者存活高中英语作文  在平常的`学习、工作或生活中,大伙都尝试过写作文吧,借助作文大家可以反映客观事物、表达思想感情、

适者存活高中英语作文

  在平常的`学习、工作或生活中,大伙都尝试过写作文吧,借助作文大家可以反映客观事物、表达思想感情、传递常识信息。如何写作文才能防止踩雷呢?以下是我们精心收拾的适者存活高中英语作文,欢迎阅读,期望大伙可以喜爱。

适者生存高中英语作文

  There is no exception to the rule that every organic being naturally increases at so high a rate, that, if not destroyed, the earth would soon be covered by the progeny of a single pair. Even slow-breeding man has doubled in twenty-five years, and at this rate, in less than a thousand years, there would literally not be standing room for his progeny.

  The elephant is reckoned the slowest breeder of all known animals, and I have taken some pains to estimate its probable minimum rate of natural increase; it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old; if this be so, after a period of from 740 to 750 years there would be nearly nineteen million elephants alive descended from the first pair.

  Can we doubt that individuals having any advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed. This preservation of favorable variations and the rejection of injurious variations, I call Natural Selection.

 
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