So we're racing time to tackle climate change in the long term and in the short term, trying to keep as many polar bears in the wild as possible. 所以长期看来,我们正在与时间赛跑,以应对气候变化, 并且在短期内,尽可能维持更多数量的野生北极熊。 But in the short term, one of the biggest ...
Polar bears are small compared to many marine mammals but large compared to most other bears. Adult males reach 2.5m in length and 800kg in mass. Along with chungongos, polar bears are perhaps the least modified morphologically, compared to terrestrial mammals, of the world's recognized marine...
They compared the genetic structure of polar bears with that of their closest relatives from warmer climate, the brown bears. 解析: 原文的意思为Liu与其同事在2014年研究中,对比了polar bears和brown bears的基因结构。 题目说的是不同组的polar bears, 但实际上是polar bears和brown bears两种不同的...
compared to other Arctic areas.Despite the declining sea ice in the Barents Sea, polar bears are likely not lacking food as long as sea ice is present during their peak feeding period.Polar bears feed extensively from April to June when ringed seals have pups and are particularly vulnerable ...
They cannot runas fast as other bears, they can become hot and tired easily,andthey have a hard time hunting animals that are not in the snow.Unfortunately for polar bears, climate change is reducingthe size of the areas where they can live. This means that theywill eventually have to ...
Mature polar bears eat only the fat of seals and leave the carcass for scavengers such as ravens and foxes. It is believed that polar bears also eat birds, bird eggs, reindeer, walrus, rodents, beluga whales, and crustaceans. The polar bear is ready to share food with other bears if the...
Ecological differences have been identified as a possible reason for the generally poorer body condition and reproduction of Beaufort polar bears compared to those from the Chukchi, but the influence of exposure to other stressors remains unknown. We use molecular technology, quantitative PCR, to ...
剑桥雅思16Test1Passage1阅读答案解析 Why we need to protect polar bears 我们为什么要保护北极熊 剑桥雅思16阅读第一套题目第一篇文章的13道题由7道TRUE/FALSE/NOT GIVEN判断和6道填空组成,整体难度不大,十分符合开篇文章的定位。希望
Polar bears live in the Arctic, on ice-covered waters. Polar bears rely on sea ice to access the seals that are their primary source of food, as well as to
Usually larger than grizzly bears, adult male polar bears can reach 10 feet in length and weigh 1,500 pounds compared to grizzly bears’ 8 feet and 800 pounds. To maintain that great mass, polar bears rely on the energy-rich fat of seals, which they best catch on the ice. ...