Natural, beautiful thing, which, in addition to the four factors that humans get
.If in a certain type of creature ecosystems destroyed to make the balance of the ecosystem is reduced, for example in polar snow and the rice is simple and plain ecological complex because there are no living beings are few types of plants. Different types of grass, Lichen, only a few types of these plants and trees of the Willow deer, which contained two types of deer are the Caribbean with Guangzhou ren media. Deer is a wild dog's food, and people. In addition, there is a rat and chicken wild rice. Therefore, in the snow. If there is a change in the number of organisms in a level will result in violence against other levels of organisms, because it did not have the opportunity to select foods. Until some kind of extinction, so complex, so no ecological damage is very easy to balance, like planting a single type, such as agriculture (monocropping) today time caused an epidemic would cause huge damage and quickly.
.There are many water-weed, rivers finally has the proportions do not suit to maintain the balance of natural systems, and obstructed traffic on the water.
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