根据第三段中的“small changes of top predators can lead to big effects throughout entire ecosystems”以及其后举的例子可知,位于食物网顶端 的掠食动物对其他物种的数量有着惊人的控制,即使 是无直接联系的物种,故答案为D “其他物种的数量会 发生意想不到的变化” 。 11.A 段落大意题。 第四段的第一句...
C. By bringing th e broken-down ecosystems back to n ormal. D. By signaling th e urgent need for taking prerentir e action. 相关知识点: 试题来源: 解析 【解析】 1.答案: B 分析: 推理判断题。 根据文章第二段With such models,scientis ts hare found out some key principles operating in...
could be alone in the universe. The first reason Earth was able to become this welcoming blue sphere is because it's at just the right distance from the Sun, in a narrow zone not too hot and not too cold, where the temperatures are compatible with liquid water and life....
Chapter 3 defines urban ecosystems and elaborates the specifics of these compared to other ecosystems, especially agricultural or forest systems, in terms of their properties and basic functionality. The abiotic bases and properties of urban ecosystems are described in detail. Different ways of ...
Dorsch, Jim. (2019, November 22). What Are The Eight Main Ecosystems?.sciencing.com. Retrieved from https://www.sciencing.com/what-are-the-eight-main-ecosystems-12352395/ Chicago Dorsch, Jim. What Are The Eight Main Ecosystems? last modified March 24, 2022. https://www.sciencing.com/what...
Define and give examples of different feeding levels in the ecosystems and Explain which feeding level is likely to include most humans? What is used by plants to extract water and nutrients from the soil? What are the main ecological roles of bacteria in the ecosystem? In any ec...
【题目】阅读理解How does an ecosystem(生态系统) work?What makes th e populations o f different speci es th e way they are? Why ar e ther e so many flies an d so few wolves? T o fin d an answer,scientists hav e built mathematical models o f f oo d webs, noting who eats whom...
根据文章最后一段Ideally, the syst em would tell us when to adapt human activit ies that are pushing an ecosystem toward a br eakdown or would even allow us to pull an eco system back from the borderline. Prevention is key, scientists say, because once ecosystems p ass their tipping ...
Ideally, the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline. Prevention is key, scientists says because once ecosystems pass their tipping point(临界点), it is remarkably...
What Are Different Types of Entrepreneurs? Not every entrepreneur is the same and not all have the same goals. Here are a few types of entrepreneurs: Builder Builders seek to create scalable businesses within a short time frame. Builders typically pass $5 million in revenue in the first two ...