have dramatically dropped since they were last surveyed almost 50 years ago, scientists discovered. The findings became surprising because, until now, the chinstraps have been deemed of “least concern” by the International Union for Conservation of Nature (IUCN). “We really didn’t know what ...
31. C 词语猜测题。由第3段第1句可知, demographic transition 指的是传统的高出 生率和死亡率向低出生率和低死亡率的 转变。 32. A 主旨大意题。由第1段第1句“Fifty years from now the world's population will be declining, with no end in sight.”可知A 项正确。
The proportion of 2-year-old fish in recent catches is higher than that 50 years ago, indicating some rejuvenation of the population after the prolonged decline. Moreover, White Sea sticklebacks in the present population grow faster than those in the 1950s. The observed shifts are concurrent ...
These statistics suggest that Atlas 14 is most applicable to the time period of 30 years ago, rather than being representative of current conditions in a changing climate, and the impacts associated with its assumption of stationarity should be closely examined. Cumulative percentages of midpoint ...
After saying goodbye to her grandchild at the school gates, Hu Chunmei started to think of ways to pass the day. Hu migrated from her home village in Hubei province to Beijing to help her daughter with child-rearing about eight years ago. Since her granddaughter started school in August, sh...
The reintroduced population in Ningshan County is unlikely to go extinct in the next 50 years. The population size was estimated to be 367, and the population genetic diversity was estimated to be 0.97. Sensitivity analysis showed that population size and extinction probability were dependent on ...
The nature reserve also recorded an increase in bird varieties from 182 a decade ago to the current 258, thanks to years of restoration and protection efforts, according to a press conference held by the municipal government.Rare and endangered bird species have returned to the wetland, and the...
Domestication has had a strong impact on the development of modern societies. We sequenced 200 genomes of the chocolate plantTheobroma cacaoL. to show for the first time to our knowledge that a single population, the Criollo population, underwent strong domestication ~3600 years ago (95% CI: 24...
In recent years, the Chilean Villa Las Estrellas has become the site of tourist activity for "fly/sail" trips to Antarctica.Only a few years ago, the only way for tourists to reach Antarctica was by ship, now it is possible to fly to Antarctica across the Drake Passage so saving a coup...
First, we used RECE samples comprised of 50 probable event count sequences and, second, we sub-sampled the RECEs with respect to time so that only every 10th observation was included. The former, of course, means that we cannot fully explore the tails of the target parameter value ...