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大利亚的自然条件相适应,它们在这块宽广的大地上过着悠闲生活。

  在生物进化史上,形成过强盛的两大类哺乳动物:有袋类动物和胎盘类动物。有袋类动物繁殖力强,在世界大陆占尽优势,六、七千万年以前有袋类动物曾遍布世界各地。在其它陆地上,由于物竞天择、适者生存的自然法则,胎盘类动物继续进化,直至出现人类,使有袋类动物面对其它高等哺乳动物的竞争而渐渐地被淘汰,并在大约2500万年前取代了几乎所有有袋类动物。而在世界“孤岛”澳洲大陆,由于没有众多的高等哺乳动物的竞争,也没有大型食肉动物的威胁,因此,有袋类动物不仅在这里生存了下来,而且渐渐适应了这里的自然环境而繁衍不息,“家丁”兴旺,并发展壮大起来,形成独特的有袋类动物种群
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尺子 4级
2009-11-13 回答
Australian adapt to natural conditions, a wide piece of land they lived a leisurely life on. 

In the history of biological evolution, the formation of too strong in two major categories of mammals: marsupials and placental animals. Marsupials reproduce prolifically in the world, mainland China are best placed, six, Qiqianwannian ago marsupials have been all over the world. In other land, due to natural selection, survival of the fittest laws of nature, placental animals continue to evolve until the emergence of human beings, so that marsupials to face competition from other higher mammals gradually been eliminated, and in some 2500 million years ago to replace almost all the marsupials. In the World "island" Australian mainland, the absence of competition in a number of higher mammals, there is no threat of large predators, therefore, marsupials survived not only here, but also gradually adapted to the natural environment here, but reproduce itself endlessly, "Jia Ding," and thrive, and grow together to form a unique population of marsupials

最新回答 (3条回答)

贴心 12级
2009-11-13 回答
Adapt to natural conditions in Australia, they are a wide piece of live a comfortable life on earth.
In the history of biological evolution, the formation of too strong in two major categories of mammals: marsupials and placental animals. Marsupials reproduce prolifically in the world, mainland China are best placed, six, Qiqianwannian ago marsupials have been all over the world. In other land, due to natural selection, survival of the fittest laws of nature, placental animals continue to evolve until the emergence of human beings, so that marsupials to face competition from other higher mammals gradually been eliminated, and in some 2500 million years ago to replace almost all the marsupials. In the World "island" Australian mainland, the absence of many higher mammals, competition,
There is no threat of large predators, therefore, marsupials survived not only here, but also gradually adapted to the natural environment and the proliferation of endless here, "Jia Ding," and thrive, and grow together to form a unique marsupials animals
Prince John 11级
2009-11-13 回答
Austrian Australian adapt to natural conditions, a wide piece of land they lived a leisurely life on.
In the history of biological evolution, the formation of too strong in two major categories of mammals: marsupials and placental animals. Marsupials reproduce prolifically in the world, mainland China are best placed, six, Qiqianwannian ago marsupials have been all over the world. In other land, due to natural selection, survival of the fittest laws of nature, placental animals continue to evolve until the emergence of human beings, so that marsupials to face competition from other higher mammals gradually been eliminated, and in some 2500 million years ago to replace almost all the marsupials. In the World "island" Australian mainland, the absence of competition in a number of higher mammals, there is no threat of large predators, therefore, marsupials survived not only here, but also gradually adapted to the natural environment here, but reproduce itself endlessly, "Jia Ding," and thrive, and grow together to form a unique population of marsupials
2009-11-13 回答

In the history of biological evolution, the formation of two major categories of mammals too powerful:Marsupials and placental animals. Marsupials reproduce prolifically in the world, mainland China are best placed, six, Qiqianwannian ago marsupials have been all over the world.In other land, due to natural selection, survival of the fittest laws of nature, placental animals continue to evolve until the emergence of human beings, so that marsupials to face competition from other higher mammals gradually been eliminated, and in some 2500 million years ago to replace almost all the marsupialsIn the World "island" Australian mainland, the absence of competition in a number of higher mammals, there is no threat of large predators, therefore, marsupials survived not only here, but also gradually adapted to the natural environment here, but reproduce itself endlessly, "Jia Ding," and thrive, and grow together to form a unique population of marsupials

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