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...
和下文Scientists have discovered new details about their ancestors and close relatives.(科学家发现了关于他们祖先和近亲的新细节。)可知,选项A.Their ancestors lived on land.(他们的祖先生活在陆地上。)是对上文的进一步解释,承上启下,符合语境。故选A。 (2)B.推理判断题。根据上文The dinosaurs had ...
根据第三段Researchers have found that whales and dolphins evolved(进化)from four-legged mammals,like the hippo,which once lived on land.Meanwhile,seals and sea lions are closely related to dogs.It seems that these ancestors grew rapidly in size when they returned to the oceans,but the new ...
The American Museum of Natural History exhibit looks at how whales' ancestors left land behind for a lengthy dip in the oceans.
Seagrasses are flowering plants that grow in marine environments and whose ancestors once lived on land where the first seeds and flowers evolved. Topics include the impact of humans on seagrass meadows, such as coastal development, and an in-depth analysis of the ecological role of seagrass beds...
Whales’ ancestors were land-dwellers about 50 million years ago before moving into water. Elemans said the animals adapted their voice boxes over tens of millions of years to make sounds underwater. Advertisement Why helping whales to flourish can help fight climate ch...
And how they got into the sea is one of the most fascinating stories of (64) Most authorities believe that 60 million years ago ancestors of modern whales were four-legged, wolf-size animals living on the sea shores, (65) an abundance of fish and shrimp tempted them to try wading. (...
While it’s tantalizing to think of even larger leviathans, there are a few things that prevent whales from being more massive. Whales breathe air, just as their amphibious ancestors did back in the Eocene, making their lungs critical hardware for animals that have to deal with vast difference...
Whales evolved from terrestrial ancestors that were dog-sized and lived on land some 50 million years ago. Over time, their size has grown 10,000-fold. Dinosaurs might have been longer, but they were not heavier by any stretch of the imagination, notesNicholas Pyenson, curator ...
In order to prove this, we need to take a deeper dive into what makes a mammal a mammal, and how the land-living ancestors of whales eventually evolved into fully-aquatic animals… Page Index A humpback whale. The bumps on its head are hair follicles: hair is a characteristic of mammals...