The land-based ancestor of whalesNature - the world's best science and medicine on your desktopdoi:10.1038/news.2007.388Sanderson, KatharineOAI
When he finally arrived back in Britain, Darwin was already starting to create his famous theory that all living things had a common ancestor (祖先).Down house At home at Down House, a place that you can still visit today, Darwin wrote many articles and books about his travels, but he ...
Eukaryotic cells evolvewhen one simple cell engulfed another, and the two lived together,more or less amicably– an example of “endosymbiosis”. The engulfed bacteriaeventually become mitochondria, which provide eukaryotic cells with energy. The last common ancestor of all eukaryotic cells had mitochon...
Whales are marine creatures known for their enormous size and that live in all the oceans on earth. One of the oldest known organisms is bowhead whales, which can survive up to 200 years, and similarly, other species of whales have shown a remarkable long lifespan. In addition to this, ...
Unlike whales or dolphins, they give birth on land. C美文 在线 Although some breeding grounds may appear inhospitable, that waterproof coat and a thick layer of blubber protects the seals from cold and wet. And the more inaccessible the sites are, the less likely they are to be di...
Manatees are also known as se a cows because of their slow, lazy nature and their grassy meals. Although they have such a name, they are more closely related to elephants. Manatees and elephants evolved from the same ancestor(祖先) over 50 million years ago.There are three kinds of ...
Although the first ten million years of whale evolution are documented by a remarkable series of fossil skeletons, the link to the ancestor of cetaceans has been missing. It was known that whales are related to even-toed ungulates (artiodactyls), but until now no artiodactyls were morphologicall...
9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook marine biology (redirected fromSea creatures) Encyclopedia marine biology The scientific study of organisms living in or dependent on the oceans. The American Heritage® Student Science Dictionary, Second Edition. ...
And there is nothing in the context to show that Hesiod's Amphidamas is to be identified with that Amphidamas whom Plutarch alone connects with the Lelantine War: the name may have been borne by an earlier Chalcidian, an ancestor, perhaps, of the person to whom Plutarch refers. View in...
5.According to Paragraph 1,killer whales hunt a seal on a piece of ice by . A.pushing the ice onto the ground B.knocking hard on the ice together C.creating large waves to wash it off the ice D.following it all the time until it swims in the sea 答案 C 解析 细节理解题。根据第...