The population of sharks is becoming smaller and smaller as a result of___. A. hunting B. lack of food C. diseases D. degeneration(退化) 相关知识点: 试题来源: 解析 A.hunting 推理判断题。由第四段和第五段可推知。反馈 收藏
The population of great white sharks is spiking near Cape Cod — and beachgoers are seeing more of them in the waterKelly McLaughlin
For many sharks, both catch rates and underwater visual surveys have been criticized as indices of abundance. In this context, estimation of population trends using individual demographic rates provides an important alternative means of assessing population status. However, such estimates involve ...
阅读理解Until the 1980s, the American homeless population comprised (组成) mainly older males. Today, homelessness strikes much younger part of society. In fact, a 25-city survey by the U. S. Conference of Mayors in 1987 found that families with children make up the fastest growing part of...
The effect of habitat on modern shark diversification Sharks occupy marine habitats ranging from shallow, inshore environments to pelagic, and deepwaters, and thus provide a model system for testing how gross ... L Sorenson,F Santini,ME Alfaro - 《Journal of Evolutionary Biology》 被引量: 48发...
aLt's easy. first,come to my home on foot Lt的容易。 首先,徒步来到我的家[translate] alt s sunday tomorrow lt s明天星期天[translate] aWhale sharks do live in other oceans of the world,but no one knows their population 鲸鲨在世界的其他海洋居住,但没人知道他们的人口[translate]...
instead C. instead of D. stand for ( )15. Mr. Green when he came out. A. became angry B. became angrily C. becomes happy D. become sad ( )16. In the past, most children couldn’t go to school poor economy. A. because B. because of C. since D. for ( )17.Sharks have ...
A 2021 study found over a third of sharks, rays and chimeras, a type of fish, are threatened with extinction, and in many parts of the world, sharks are still overfished. Every year, humans kill 73 to 100 million sharks for their fins, according to the Shark Research Institute. ...
Long-term population stability of large coastal sharks in the main Hawaiian IslandsDean, RG, Jason
Levels of genetic variation are significantly lower than those in marine teleosts. Sharks exhibit little genetic heterogeneity across wide geographic ranges; however, some stock structure has been detected both within and between oceans. Molecular characters have been used to confirm the presence of ...