长颈鹿脖子为什么那么长英语作文
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发布时间：2022-04-22 06:58
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热心网友
时间：2022-06-17 02:13
是长颈鹿吧，双语对照
生物进化是单方向的,无法回头。一旦选定了某种进化路线,就必须强化它完善它,不能原路退回到开始的状态。
Evolution is the single direction, can't turn back. Once a evolving route, we must strengthen its complete it, can't the way to return to form.
生物在繁殖下一代时都会选择身体强壮基因优良的个体，此之为性择。(这在人类也很常见，女*都喜欢身体强壮的男人。)
Biological in the breeding when the next generation will select the body strong gene excellent indivial, and this choice for sex. (this is also a very common in humans, women mostly like a strong man.)
在一个长颈鹿种群之中，在一个历史时期有一个脖子的平均长度，但是肯定也存在比平均值高的和比平均值小的。按照正态分布，长于平均的和短于平均的都占少数，而在平均值附近的占绝大多数。
In a giraffe population in, in a historical period have a neck of the average length, but certainly there are also higher than the average and than the average small. According to the normal distribution, longer than average and short in the average all the minority, on average, and nearby in a majority of cases.
长颈鹿在取食过程中，平均值长度可以够到的叶子肯定被采食的更多，这个高度的食物竞争也会更激烈，因为大家都够得着。但是明显高于平均值的个体就能吃到群体中大部分吃不到的叶子从而拥有更多食物，也就能长的更强壮健康，成为种群中最具有“魅力”和竞争力的个体。到了繁殖季节，雌性长颈鹿显然更青睐于体格强壮的脖子长的长颈鹿，脖子上的长颈鹿也就有机会繁殖更多后代。而平均值附近的长颈鹿显然竞争不过长脖子的，而短脖子的由于吃的比别人少，个头比别人小，能繁殖的机会也大大小于别的个体。这种情况在每一个繁殖季节，每一代长颈鹿都重复的发生着。于是长脖子长颈鹿的基因在群体中占的比例越来越大，而整个长颈鹿群体脖子的平均值也在被拉高，进而强化着这种淘汰机制。于是在相当长的时期之后，长颈鹿的脖子就会越来越长。
The giraffe in feeding process, the average length can reach the leaves must be more food intake, the height of food competition will be more competitive, because everyone reach. But obviously higher than the average indivial can eat to eat less than most of the population in the leaves and have more food, also can long more strong and healthy, and become the most population has "charm" and competitiveness of the indivial. The breeding season, the female apparently more interest in the giraffe strong breed of neck long giraffes, neck giraffe will have the chance to breed more offspring. And the average of the competition but apparently near a giraffe long neck, and short neck because of the eating more than others to be less, and smaller than others, can reproce the chance of much less than other indivial. This is the case in every breeding season, each generation of giraffes are repeated occurring. So the long neck the giraffe's genes in a population in the proportion of more and more large, and the giraffe's neck is also in group average is pulled, and strengthen the mechanism of elimination. So for a long time after, the giraffe's neck, and will be more and more long.
