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大自然中的各种生命,多姿多态,千奇百怪,组成了一根长长的生命链。在生态链上,一环接着一环,一环扣着一环。任何环节,都受着别的环节的制约。达尔文曾经说过,海军吃的牛肉的多少,得看三叶草是否丰收;而三叶草的丰收与否,要看蜜蜂的多少,蜜蜂多,则三叶草的种子结得就多;蜜蜂的多少要看老鼠的多少而定,老鼠多了,它吃掉的蜜蜂就多,传播的三叶草花粉就少;老鼠的多少又受着猫的制约,猫越多,老鼠越少,蜜蜂就多,三叶草就
All kinds of life in nature, colorful, all sorts of strange things, formed a long chain of life. In the ecological chain, a ring followed by a ring buckle. Any link, are subject to other aspects of the constraints. Darwin once said that the number of beef the Navy eat, depending on whether the harvest clover; and clover bumper harvest or not, depends on the number of bees, bees and more, then the clover seeds knot more; how many bees depends on the mouse Depending on the number of mice, the more bees they ate, the more bee they eat, the less the clover pollen that spreads; the more the cats are subjected to cat restraints, the more cats, the fewer mice, the more bees, the more the clover