Poems such as "Grassing across the plain, coming and going with the four seasons" and "Endless, the river and the moon are similar every year" contain the phenomenon of "growth and reproduction" of creatures. "Wildfire has never exhausted them, and they are tall again in the spring breeze" can explain the stability of ecosystem resilience. "Sweet, they press on the ancient high road and reach the crumbling gate" shows that "creatures can not only adapt to the environment, but also influence it". In "weeding at noon and sweat dripping down the soil", weeding has two functions: one is to loosen the soil, enhance the respiration of crop root cells and promote the absorption of mineral ions by roots; The second is to eliminate weeds, reduce the competition between crops and weeds, and let energy flow to crops. "In April, the beauty of the world is exhausted, and the peach blossoms in the mountain temples begin to bloom." "It is not surprising that plum blossoms are full of snow and flies freeze to death." It can be seen that "ecological factors have an impact on biology." Here, the physical factor that affects the ecosystem is temperature. "A drop in the spring brings ten thousand kinds in the autumn", which shows that living things have the characteristics of reproduction. At the same time, it also explains the problem of "over-reproduction" in Darwin's theory of natural selection. "The silkworm will weave until it dies, and the candle will weep every night" actually refers to the abnormal development of silkworm. The so-called silkworm death here actually goes through the stage of "larva → pupa". "The children ran after Huang Die and flew into the cauliflower without finding it", which shows that Huang Die's body color and environment are very similar. This phenomenon is called "protective color" in biology and is the result of long-term natural selection. A little red among evergreen trees not only shows the "warning color" in biology, but also shows the problem of "gene mutation" in biology. "Falling red is not a heartless thing, but turning into spring mud protects flowers more", which thoroughly explains the characteristics of "material cycle of ecosystem": repeated appearance and cycle. "In the fragrance of rice flowers, it is said that the harvest year is good, and frogs are heard one by one", which explains the relationship between frog protection and crop harvest. Protecting frogs is protecting natural enemies of pests. The reason why February leaves are red is that chlorophyll synthesis in cells decreases and anthocyanin content increases due to the influence of temperature. "Boil beans and burn beans, and beans cry in the pot; This is the same root, why rush to speculate with each other? " This vividly illustrates the problem of intraspecific struggle in biological struggle for existence. "all loves can't be caged, and an apricot comes out of the wall", "Because of the wind, there is no catkin, only sunflower depends on the sun", which shows the phototropism of plants. In addition, proverbs, sayings and allusions in our country also contain a lot of biological common sense. "As you sow, you reap" explains this genetic phenomenon. "One mother gives birth to nine children, even ten mothers are different" explains the variation phenomenon. "The mantis catches cicada, and the yellowbird is behind" and "The big fish eat small fish, the small fish eat shrimp, and the shrimp eat mud" all explain the food chain relationship of the ecosystem, and can also explain the "predation" relationship among the organisms in the food chain. From "unruly people enter barren land" to "green mountains and green waters are always in spring", it shows that the main factor affecting the ecosystem is forest. "Fighting between snipes and mussels" vividly illustrates one of the ways of nerve regulation, "conditioned reflex". "One mountain can't accommodate two tigers" is interpreted from the ecological point of view as "tigers are in the highest trophic level and get less energy, so the number of individuals should be less".