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Microscopes The Beringia Landscape
During the peak of the last ice age,northeast Asia(Siberia)and Alaska were connected by a broad land mass called the Bering Land Bridge.This land bridge existed becau so much of Earth’s water was frozen in the great ice sheets that a levels were over 100 meters lower than they are today.Between 25,000 and 10,000 years ago,Siberia,the Bering Land Bridge,and Alaska shared many environmental characteristics.The included a common mammalian fauna of large mammals,a common flora compod of broad grasslands as well as wind-swept dunes and tundra,and a common climate with cold,dry winters and somewhat warmer[没有wanner这个单词和summer搭配哈，我觉得应该是转码故障导致的问题，应该是warmer。]summers.The recognition that many aspects of the modem flora and fauna were prent on both sides of the Bering Sea as remnants of the ice-age landscape led to this region being named Beringia.
梦到家里被盗 It is through Beringia that small groups of large mammal hunters,slowly expanding their hunting territories,eventually colonized North and South America.On this archaeologists generally agree,but tha
t is where the agreement stops.One broad area of disagreement in explaining the peopling of the Americas is the domain of paleoecologists,but it is critical to understanding human history:what was Beringia like?
The Beringian landscape was very different from what it is today.■A Broad,windswept valleys;glaciated mountains;spar vegetation;and less moisture created a rather forbidding land mass.■B This land mass supported herds of now-extinct species of mammoth,bison,and hor and somewhat modern versions of caribou,musk ox,elk,and saiga antelope.■C The grazers supported in turn a number of impressive carnivores,including the giant short-faced bear,the saber-tooth cat,and a large species of lion.■D
星期一怎么读 The prence of mammal species that require grassland vegetation has led Arctic biologist Dale Guthrie to argue that while cold and dry,there must have been broad areas of den vegetation to support herds of mammoth,hor,and bison.Further,nearly all of the ice-age fauna had teeth that indicate an adaptation to grass and dges;they could not have been supported by a modern flora of moss and lichens.Guthrie has also demonstrated that the landscape must have been subject to inten and continuous winds,especially in winter.He makes this argument bad on the anatomy of hor and bison,which do not have the ability to arch for food through deep snow cover.They need
landscapes with strong winds that remove the winter snows,exposing the dry grass beneath.Guthrie applied the term“mammoth steppe"to characterize this landscape.
当参和党参一样吗>小小爱因斯坦 In contrast,Paul Colinvaux has offered a counterargument bad on the analysis of pollen in lake diments dating to the last ice age.He found that the amount of pollen recovered in the diments is so low that the Beringian landscape during the peak of the last glaciation was more likely to have been what he termed a"polar dert,"with little or only spar vegetation,in no way was it possible that this region could have supported large herds of mammals and thus,human hunters.Guthrie has argued against this view by pointing out that radiocarbon analysis of mammoth,hor,and bison bones from Beringian deposits revealed that the bones date to the period of most inten glaciation.
The argument emed to be at a standstill until a number of recent studies resulted in a spectacular suite of new finds.The first was the discovery of a 1,000-square-kilometer prerved patch of Beringian vegetation dating to just over 17,000 years ago—the peak of the last ice age.The plants were prerved under a thick ash fall from a volcanic eruption.Investigations of the plants found grass,dges,moss,and many other varieties in a nearly continuous cover,as was predicted by Guthrie.But this vegetation had a thin root mat with no soil formation,demonstrating that
高考百日誓师大会there was little long-term stability in plant cover,a finding supporting some of the arguments of Colinvaux.A mixture of continuous but thin vegetation supporting herds of large mammals is one that ems plausible and realistic with the available data.
Paragraph 1
中华美少年 During the peak of the last ice age,northeast Asia(Siberia)and Alaska were connected by a broad land mass called the Bering Land Bridge.This land bridge existed becau so much of Earth’s water was frozen in the great ice sheets that a levels were over 100 meters lower than they are today.Between 25,000 and 10,000 years ago,Siberia,the Bering Land Bridge,and Alaska shared many environmental characteristics.The included a common mammalian fauna of large mammals,a common flora compod of broad grasslands as well as wind-swept dunes and tundra,and a common climate with cold,dry winters and somewhat warmer summers.The recognition that many aspects of the modem flora and fauna were prent on both sides of the Bering Sea as remnants of the ice-age landscape led to this region being named Beringia.
形容赚钱多的成语 1.The word"remnants"in paragraph 1is clost in meaning to
A.remains
B.evidence
C.results
D.reminders
