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  3. An ecosystem is a group of animals and plants living in a specific region and interacting with one another and with their physic

An ecosystem is a group of animals and plants living in a specific region and interacting with one another and with their physic

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问题 An ecosystem is a group of animals and plants living in a specific region and interacting with one another and with their physical environment．Ecosystems include physical and chemical components，such as soils，water，and nutrients that support the organisms living there．These organisms may range from large animals to microscopic bacteria．Ecosystems also can be thought of as the interactions among all organisms in a given area；For instance，one species may serve as food for another．People are part of the ecosystems where they live and work．Human activates can harm or destroy local ecosystems unless actions such as land development for housing or business are carefully planned to conserve and sustain the ecology of the area．  
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答案生态系统就是一个动植物群体，这个群体生活在特定区域，而且彼此之间以及与它们的环境之间相互影响。生态系统包括物理的和化学的成分，例如，土壤，水以及供给有机体生活的养分。这些有机体中既有臣型动物也有小的微生物细菌。生态系统也可以被看作是特定区域所有有机体的互动；例如，一个物种可能是另外一个物种的食物。人类也是他们生活和工作的生态系统的一部分。人类的活动会伤及甚至破坏当地的生态系统，除非诸如用于住房或商业发展的土地政策认真地考虑了去保护和维持当地的生态系统。
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