“Plantswereexpectedtogetlargerwithincreasedcarbondioxi...
问题详情:
“Plants were expected to get larger with increased carbon dioxide in the atmosphere,but changes in temperature,humidity (湿度) and nutrient availability seem to have trumped(胜过) the benefits of increased carbon dioxide,”said researchers from the National University of Singapore.
45 percent of the species studied now reach smaller adult sizes than they did in the past. The researchers pointed out that warmer temperatures and changing habitats,caused by climate change,are possible reasons for the shrinking of creatures.
“We do not yet know the exact mechanisms(机制)involved,or why some organisms are getting smaller while others are unaffected,”the researchers said. “Until we understand more,we could be risking negative consequences that we can't yet quantify.”
The change is big in coldblooded animals. Only two decades of warmer temperatures are enough to make creatures smaller. An increase of only 1 ℃ causes nearly a 10 percent increase in metabolism(新陈代谢).Greater use of energy results in tiny tortoises and little lizards. Fish are smaller now too. Though overfishing has played a part in reducing numbers,experiments show that warmer temperatures also stop fish growing.
Warmblooded animals aren't immune (免除) from the size change caused by climate birds are now smaller. Red deer are weaker. And polar bears are smaller,compared with historical records.
This isn't the first time that has happened in Earth's history.55 million years ago,a warming event similar to the current climate change caused bees,spiders and ants to shrink by 50 to 75 percent over several thousand years. That event happened over a longer time than the current climate change.
The speed of modern climate change could mean organisms may not respond or adapt quickly enough,especially those with long generation times. So,it is likely that more negative influences of climate change will be shown in the future.
does the text mainly talk about?
A.Why some species become smaller.
B.How climate changes in Earth's history.
C.Climate change has many negative effects.
D.Species are becoming smaller as climate gets warmer.
archers from the National University of Singapore believe that________.
A.they have found the exact causes for creatures getting smaller
B.increase in energy use can lead to creatures getting smaller
C.climate change has more negative effects on warmblooded animals
D.all the animals on the earth have become smaller
does the author feel about the climate change?
A.Worried. B.Optimistic. C.Disappointed. D.Shameful.
【回答】
DBA
知识点:科普环保类阅读
题型:阅读理解
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已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为 ( ) A.FeO ...
问题详情:已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为()A.FeO B.Fe2O3C.Fe3O4 D.无法判断【回答】B知识点:金属的化学*质题型:选择题...
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______bytheclearwaters,thisforestprovidesvisitorswithaw...
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(福建卷)8.简答题。(选做一题)(5分)(1)阅读下面的《三国演义》第十九回(下邳城曹*鏖兵)选段,完成后面...
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“吃得营养、吃出健康”是人们普遍的饮食追求,下列说法不正确的是A.人每天都应摄入一定量的蛋白质B.过量食用油脂...
问题详情:“吃得营养、吃出健康”是人们普遍的饮食追求,下列说法不正确的是A.人每天都应摄入一定量的蛋白质B.过量食用油脂能使人发胖,故应禁止摄入油脂C.糖类是人体能量的重要来源D.过量摄入微量元素不利于健康【回答】B知识点:各地中考题型:选择题...
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