地球上的生命是多种多样、形形色色的。陆地有陆地的生物,水中有水中的生物。温热地带有生物,寒冷地带也有生物。所有这些生物是怎么形成的呢?近代生物科学的研究告诉我们,生物是由无生物发展而来的,生命是物质运动的特殊形式。而现代的植物、动物和人,是由那些最简单、最原始的生物逐步发展而来的。自从生命在地球上产生以后,它们就从简单到复杂、从低级到高级不断地“世界上究竟先有鸡,还是先有蛋?”在我国,这是一个常常有人提到的问题,许多人都回答不出来。但是,从生物进化的观点来看,它就很容易回答。家鸡的祖先可能 Life on earth is varied and varied. Terrestrial organisms on land, aquatic creatures in water. The creatures are warm and warm, and there are creatures in the cold zone. How did all these organisms form? The study of modern biological science tells us that biology has evolved from inanimate organisms, and life is a special form of material movement. Modern plants, animals and humans have evolved from the simplest and most primitive creatures. Since the birth of life on the earth, they have gone from simple to complex, from low to high, constantly, “Is the world first to have chickens or eggs?” In our country, this is a question that is often mentioned by many people. Can’t answer it. However, from the point of view of biological evolution, it is easy to answer. The ancestral home of chickens may