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据专家们估计,从恐龙灭绝以来,当前地球上生物多样性损失的速度比历史上任何时候都快。生物多样性日减的原因不可能是


A.由于栖息地的丧失、自然资源的不合理利用、气候变化等原因
B.外来入侵物种通过压制或排挤本地物种,危及本地物种的生存
C.在可以预见的未来,部分动植物种群可能受到灭绝的威胁
D.现代先进交通工具为外来入侵物种长距离迁移、传播、扩散到新的环境中创造了条件

所属分类: 生物 (免费栏目) 浏览量: 78 次


Biologists have pointed out that, under natural conditions, species of extinct species and new species of the species is basically balanced. But with the increase of population and economic development, the balance has been destroyed. According to the experts estimate that from the extinction of dinosaurs on earth since the current biodiversity loss rate than the history of any time soon, now 。yanjiang。com。cn。 the rate of extinction of birds and mammals may be 100 times those in the undisturbed nature even 1000 times. From 1600 to 1996, the world lost 164 birds; from 1871 to 1970, 43 kinds of mammals extinction on earth's own life. Since there were a total of 2 billion 500 million species of animals the plant, which has nearly 1 / 2 is lost in the last 3 centuries.
Around us there are beautiful trees, fragrant flowers, flying birds, called the frog, swimming fish...... They make us feel the beauty of the world, but humans are malicious to destroy some of the original beautiful things, abuse of animals to eat animals, spoil the felling of plants...... It is only because of the strong domination of nature? Since it is given us all, but we have to destroy the nature and why?生物学家指出,在自然状态下,物种灭绝的种数与新物种出现的种数基本上是平衡的.但是随着人口的增加和经济的发展,这种平衡已经受到破坏.据专家们估计,从恐龙灭绝以来,当前地球上生物多样性损失的速度比历史上任何时候都快,鸟类和哺乳动物现在的灭绝速度或许是它们在未受干扰的自然界中的100倍甚至1000倍.从1600年到1996年,世界上消失了164种鸟;从1871年到1970年,兽类灭绝了43种.地球上自有生命以来,共出现过25亿种动植物,其中有将近1/2是在最近3个世纪内消失的.
我们的周围有美丽,中,国演。讲网,的树木,芬芳的花朵,飞翔的小鸟,欢叫的青蛙,畅游的鱼儿……它们让我们感觉到这个世界多美好.但是人类却恶意地去破坏一些原本美丽的事物,滥捕狂吃动物,糟蹋砍伐植物……难道仅是因为强者独尊?既然是大自然赐予了我们一切,可是我们却又为何去破坏大自然呢?

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