Reports on evidence that whales' ancestors walked on land on four feet, uncovered by fossil hunters in the Egyptian desert. Mesonychids and their origins; How the land mammals became aquatic mammals; Evolution of whale's body and loss of hind feet; Theories about mesonychid descendant ...
Humpback, Grey, Orca,Bowhead, Blue, Right, and Minke whales. Like all mammals, Alaska whales breathe air into lungs, are warm-blooded, breast-feed their young, and have some (although very little) hair. The Alaska whales ancestors lived on land, and their adaptions to a fully...
以及They continued to breathe oxygen from the air,just like land animals.(他们继续从空气中呼吸氧气,就像陆地动物一样。)可知,本段主要讲述生活在水里的哺乳动物还保留有和陆地动物相同的一些特征,因此选项F.The newly aquatic mammals kept some characteristics from their ancestors' lives on land.(新的水生...
Far back in ancient times, the ancestors of whales lived on land as well as the ancestors of cattle and sheep. Later, the environment changed, the whale ancestors living near the land of Asami Ri; and after a long time, their forelimbs and tail became a fin, hindlimb completely degraded...
The American Museum of Natural History exhibit looks at how whales' ancestors left land behind for a lengthy dip in the oceans.
Today's cetaceans include dolphins, whales and porpoises, but their early ancestors lived on land, some resembling small deer. Over time they moved into the water, and basilosaurids are believed to be the first cetaceans to have a fully aquatic lifestyle. ...
E. They were probably searching for food. F. Their ancestors lived on land.同步阅读补全短文(选项中有一项为多余选项)1.F2.3.E4.B5.C 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
Many origin myths of coastal peoples feature animals as creators, ancestors, protector and totem animals, and they continue to provide a frame of reference for modern experiences of, and narratives about, the shore. At the same time, fish 展开 ...
Whales Online, a magazine published by the Group for Research and Education on Marine Mammals (GREMM), published an article referring to the whales' front limbs (emphasis ours): The front limbs of whales' land-roaming ancestors grew much shorter and transformed into pectoral fins. The bones are...
Although their ancestry has been much debated, DNA studies and skeletal evidence from extinct early whales indicate that whales evolved from the ancestors of artiodactyls, a group that includes hippopotamuses, cattle, swine, deer, and chevrotains; DNA evidence suggests that whales are most closely...