B. Rapid economic development threatens ani mal habitats. C. Species of commercial valu e dominat e othe r species. D. Industrial activities help keep food webs st able.【小题4 】 How does an early-warning system h elp us maintain th e ecological balance? A. By getting illegal practices...
B. Rapid economic development threatens animal ha bitats. C. Species of commercial valu e dominat e other speci es. D. Industrial activities help keep food webs stabl e.How does an early-warning system help us maintain th e ecological balance? A. By getting illegal practices under control. ...
B . Rapid economic development threatens animal habitats. C . Species of commercial value dominate other species. D . Industrial activities help keep food webs stable. (5) How does an early-warning system help us maintain the ecological balance? A . By getting illegal practices under control....
How does an ecosystem（生态系统）work？What makes the populations of different species the way they are？Why are there so many flies and so few wolves？To find an answer，scientists have built mathematical models of food webs，noting who eats whom and how much each one eats. 一个生态系统是...
B.Rapid economic development threatens animal habitats. C.Species of commercial value dominate other species. D.Industrial activities help keep food webs stable.【小题5】How does an early-warning system help us maintain the ecological balance? A.By getting illegal practices under control. B.By sto...
How does an ecosystem(生态系统) work?What makes the populations of different species the way they are? Why are there so many flies and so few wolves? To find an answer, scientists have built mathematical models of food webs, noting who eats whom and how much each one eats.With such mode...
A. Species of commercial valu e dominat e other spe cies B.Rapi d economic development threatens animal h abitats. C.Uncontroll e d human activities greatlyunset ecos vstems. D.Industrial activities help keep foo d webs stable(4) How does an early.warning system help us maintain th e ...
The unemployment rate is the proportion of the labor force that is unemployed but actively looking for work. It is an important indicator of the labor market’s health and sheds light on the level of economic activity. High unemployment rates indicate a low labor market and a low level of ...
This article aims to create a model for the underlying economic logic of the feudal economy, which can then be contrasted with the much better-known models for the capitalist economy. It does so by developing a discussion of a very frequent pattern in pre-industrial, feudal, societies: active...
Even if the same money is being exchanged over and over again, the more transactions that take place, the greater the amount of wealth and economic activity. The Role of Debt Not all transactions are based on direct exchanges of cash. Credit is the system of financing transactions either ...