据今几亿年前,地球上出现了最早的生物,它不是我们高等动物,而是植物。由此可见,它比我们的生命更加久远。而动物的出现可是晚了很久很久,植物比动物出现得早,说明它们更先进些,而植物与动物的最大区别在于它们的供养方式。植物是自养,而动物几乎都是异常。这也许就是动物与植物的最大差别吧。这一切都归于植物内含有的一种叫叶绿索的物质,它使植物能发生光合作用,进行自养。动物可设这个本事,而我们人又是动物中的高等动物,也与植物这一优点无法相比。 According to a few hundred million years ago, the earliest creatures appeared on the earth. It is not our higher animals but plants. This shows that it is older than ours. However, the appearance of animals is too late for a long time. Plants appear earlier than animals, indicating that they are more advanced, and the biggest difference between plants and animals is their way of feeding. Plants are autotrophic, and animals are almost always abnormal. This may be the biggest difference between animals and plants. All this is attributed to a substance called chlorophyll that is contained in plants. It allows plants to undergo photosynthesis and self-support. Animals can set this skill, and we humans are higher animals in animals, and can not compare with the advantages of plants.