任何生物有机体的生存都不是孤立的;每一种生物同其周围环境是相互依存、相互联系、相互制约的,彼此之间形成一个极为复杂的生态系统。达尔文曾提出猫同三叶草丰产的相关理论,指出:“……几种三叶草的受精,亦需要蜂类为媒介。例如白三叶草有20串花序,结2290颗种子,其他20串,遮住了不让蜂类接触,即不 No living organism is isolated in its own right; every living creature is interdependent, interconnected and constrained with its surroundings, creating an extremely complex ecosystem with one another. Darwin has put forward the relevant theory of high yield clover with cats, pointed out: "... ... several clover fertilization, but also the need for bee media .For example, white clover has 20 strings of inflorescences, knot 2290 seeds, the other 20 strings, not covered Let the bees touch, that is not