1I.话题与高考阅读理解Food webs may be dominated by many weak links because that(2019·天津高考·C)arrangement is more stable over the long term. If a predatorHow does an ecosystem(生态系统) work? What makescan eat several species,it can survive the extinction(灭绝) ofthe populations of dif...
根据第一段内容"The populations of common animals are just as likely to rise or fall in number in a time of accelerating (加速) global warming as those of rare species, a study suggests.一项研究表明,在全球变暖加速的时期,普通动物的数量上升或下降的可能性与稀有物种的数量相同。"可知,随着全球...
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 models,scientists have found out some key ...
detritivores (organisms that eat dead plant and animal matter), and decomposers (organisms that break down dead or decaying organic matter), which could have a positive effect on sport fish, seabird, crab, and even shrimp populations. Available evidence indicates that 40– 60 percent ...
They tracked monthly changes in bird populations, air quality, and regulation status (治理现状) for 3,214 US counties over a period of 15 years. The findings suggest that ozone pollution is most harmful to the small birds — such as sparrows, warblers and finches — that make up 86% of ...
根据划线词后“one species that is moving in the opposite direction of such loss is America’s native wildlife — wood stork.(但有一种动物却在朝着相反的方向发展,那就是美国本土的野生动物——林鹳)”和第二段中“Today, it numbers 10,000 mating pairs, and the Fish and Wildlife Service is ...
While many animal populations seem to be dwindling, one species that is moving in the opposite direction is America's native wood stork (林鹳).The wood stork is the only stork that breeds in North America. In 1984, it was declared an endangered species after its population fell to just 5...
Many of our animal friends may not be around for much longer,however,and many of the mare in great danger.According to a study,the populations of animals including mammals(哺乳动物),birds and fish have fallen by an average of 60 percent since 1970.What's worse,a study in...
doi:10.1016/j.gecco.2020.e01059Yin YangGao ChenWeibang SunGlobal Ecology and Conservation
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 models, scientists have found out some ...