Mass Extinction: Life at the Brink tells that story. The hour-long documentary, airing on the Smithsonian Channel, explores the causes of two of Earth's five mass extinctions: the dinosaurs' demise and the "Great Dying." That long-ago extinction, roughly 252 million years ago, saw as many...
The problem with this graph is that before 500 years ago, extinction rates are approximated from studying fossils, which is a notoriously unreliable method of measuring extinction rates. As explained in the textbookBiodiversity and Environmental Philosophy, the “benchmark for assessing the severity of...
Humans have already wiped out hundreds of species and pushed many more to the brink of extinction through wildlife trade, pollution, habitat loss and the use of toxic substances. But the findings published in the scientific journalProceedings of the National Academy of Sciences(PNAS) show that the...
OSLO (Reuters) - Life in the oceans is at imminent risk of the worst spate of extinctions in millions of years due to threats such as climate change and over-fishing, a study showed on Tuesday.Time was running short to counter hazards such as a collapse of coral reefs or a spread of ...
【答案分析】画线词所在句中的"wildlife trade, pollution, habitat loss"与 "the use of toxic substances"并列,由此推断画线词所在内容(the use of toxic substances)应是物种灭绝的原因之一,结合选项和常识可知A项正确。 33.A【命题意图】考查理解文章结构的能力。 【答案分析】通读第三段可知,2001年至2014...
“It’s a miracle,” said lead author Dawson White, a postdoctoral researcher in the Department of Organismic and Evolutionary Biology at Harvard. “Many of Centinela’s plants are still on the brink of extinction, but fortunately the reports of their demise were exaggerated. There’s still tim...
American journalist Elizabeth Kolbert authored The Sixth Extinction: An Unnatural History in 2014. This is a non-fictional account of what Kolbert had named "the sixth extinction": an extinction event caused by humans similar to ones that destroyed earlier forms of life, like the dinosaurs and ...
A new study in PNAS highlights the mass extinction we are currently undergoing and how losing species would devastate entire ecosystems and upend human life as well. The researchers emphasize the need for immediate action that includes designating any species with populations less than 5,000 as “...
The Sixth Mass Extinction, largely caused by humans, has been confirmed through new research emphasizinginvertebrates’ extinction, differing effects on marine and terrestrial life, human influence on the biosphere, and the insufficient political response. ...
This volcanic eruption created extreme global warming and the extinction of 70% of marine life. These two examples are not the only times Earth has experienced mass extinction. An extinction may be viewed as a natural part of evolution that occurs when a large proportion of a particular species...