| 单词 | placental mammal |
| 例句 | Species with longer jaws have room for more teeth -- and, like humans, their total tooth complement is closer to what the ancestor of placental mammals had. Fruit, nectar, bugs and blood: How bat teeth and jaws evolved for a diverse dinnertime 2023-10-26T04:00:00Z This led to the identification of tissue-specific gene expression signatures that resemble those from living extant marsupial and placental mammals. RNA for the first time recovered from an extinct species 2023-09-19T04:00:00Z In contrast, placental mammals, which give birth to live offspring, have young that start out relatively large. How Sauropod Dinosaurs Became the Biggest Land Animals Again and Again 2023-08-15T04:00:00Z Dr. Flannery compared them to the Ford Model T “of modern or placental mammals.” Fossils Where They Don’t Belong? Maybe We Just Didn’t Look Hard Enough. 2023-07-16T04:00:00Z There are 18 to 20 orders of placental mammals. Fundamentals of Biology 2015-01-01T00:00:00Z Eutherian mammals are sometimes called placental mammals, because all species have a complex placenta that connects a fetus to the mother, allowing for gas, fluid, waste, and nutrient exchange. Concepts of Biology 2013-04-25T00:00:00Z She writes, “The blue whale, the bumblebee bat, and you and I are placental mammals,” all teetering on the age of annihilation. Sun Yung Shin’s poems explore the world of transnational adoption in ‘The Wet Hex’ 2022-06-23T04:00:00Z Scientists have debated these questions since the 1870s, when the first fossils of Paleocene placental mammals emerged in New Mexico. How Mammals Conquered the World after the Asteroid Apocalypse 2022-05-17T04:00:00Z But unlike the other creatures, they are Old World placental mammals, an evolutionary group not previously represented. Meet the Newest Member of the Fluorescent Mammal Club 2021-02-18T05:00:00Z Eutherian mammals are sometimes called placental mammals because all species possess a complex placenta that connects a fetus to the mother, allowing for gas, fluid, and nutrient exchange. Fundamentals of Biology 2015-01-01T00:00:00Z Like reptiles, monotremes have one posterior opening for urinary, fecal, and reproductive products, rather than three separate openings like placental mammals do. Concepts of Biology 2013-04-25T00:00:00Z Things got worse about 4000 years ago when people introduced the dingo, a placental mammal from Asia that was a more efficient hunter than the Tasmanian tiger or devil and quickly outcompeted them. Giant reptiles once ruled Australia. Their loss sparked an ecological disaster 2019-10-11T04:00:00Z Chief among these hallmarks of placental mammals is the capacity to birth well-developed young, which gestate for a prolonged period inside the mother before being born in an advanced state. How Mammals Conquered the World after the Asteroid Apocalypse 2022-05-17T04:00:00Z This mechanism for maintaining symmetry in development would, however, work only with placental mammals. Readers Respond to the October 2018 Issue 2019-02-01T05:00:00Z Eutherian mammals are sometimes called placental mammals, because all species possess a complex placenta that connects a fetus to the mother, allowing for gas, fluid, and nutrient exchange. Fundamentals of Biology 2015-01-01T00:00:00Z Before birth, marsupials have a less complex placental connection, and the young are born much less developed than in placental mammals. Concepts of Biology 2013-04-25T00:00:00Z So far, no one has created a placental mammal entirely outside a uterus. Why I testified in the Argentina abortion debate 2018-07-16T04:00:00Z But after about 2 days, the mother’s immune system “rejects” the embryos, causing the birth of a litter still at a very immature developmental stage compared to placental mammals. The key to a successful pregnancy: a tamed immune reaction 2018-01-10T05:00:00Z Now, a study of gene expression in early pregnancy, when the embryo implants in the uterus, suggests that placental mammals evolved the ability to turn an inflammatory attack on the embryo into an advantage. Armadillo, Hedgehog and Rabbit Genes Reveal How Pregnancy Evolved 2018-01-10T05:00:00Z Mostly isolated for much of the Cenozoic, South America was home to a remarkable, endemic assemblage of big, herbivorous placental mammals, marsupial-like predators and omnivores, predatory flightless birds, diverse crocodyliforms and more. Darin Croft's Horned Armadillos and Rafting Monkeys 2017-10-01T04:00:00Z It was an agile little carnivore that was able to make a living for itself when there were plenty of placental mammals doing the same. Keep Sharp, Metatherians 2017-09-16T04:00:00Z We are placental mammals: embryos can only develop to maturity within a woman’s womb. Why I testified in the Argentina abortion debate 2018-07-16T04:00:00Z But later in evolution, placental mammals dialed back that inflammation to allow extended gestation. The key to a successful pregnancy: a tamed immune reaction 2018-01-10T05:00:00Z But in placental mammals, the embryo does not simply cling to the uterus. Armadillo, Hedgehog and Rabbit Genes Reveal How Pregnancy Evolved 2018-01-10T05:00:00Z Taxonomists usually separate marsupials — including kangaroos, wallabies and wombats — from placental mammals, also known as eutherians, such as mice and people. Wallaby milk acts as a placenta for babies 2017-09-11T04:00:00Z Tsidiiyazhi lived at a time when the planet was undergoing great change, with placental mammals and flowering plants also diversifying rapidly. Fossil sheds light on bird evolution after asteroid strike - BBC News 2017-07-10T04:00:00Z Their brains, like those of all marsupials, are very different from the brains of placental mammals. Tasmanian Tigers’ Brains Yield Clues Long After Extinction 2017-01-20T05:00:00Z But in many other placental mammals, they disappear right after implantation. The key to a successful pregnancy: a tamed immune reaction 2018-01-10T05:00:00Z His preliminary studies found that cells lining the uterus of placental mammals suppress the production of interleukin-17. Armadillo, Hedgehog and Rabbit Genes Reveal How Pregnancy Evolved 2018-01-10T05:00:00Z In the ensuing Paleogene, it was the placental mammals that took advantage of the metatherian demise and blossomed into the many familiar groups we know today, including our primate forebears. Readers Respond to Rise of the Tyrannosaurs 2015-08-28T04:00:00Z Of the placental mammals, Moore said, the panda has the tiniest babies in comparison to the size of the mother. Why giant panda cubs are so incredibly tiny 2015-08-25T04:00:00Z The researchers said they did not expect to find hand preference in kangaroos or other marsupials - the pouched mammals - because of brain differences from the more common placental mammals, including primates, the researchers said. That's right, kangaroos are left-handed 2015-06-18T04:00:00Z "I am trying to piece together the conditions under which the ancestral placental mammals evolved so incredibly rapidly once the asteroid impact killed off the non-avian dinosaurs 65 million years ago." Secrets of the speedy elephant shrew 2014-01-16T02:56:51Z It carried the ancestors of plants, a certain type of placental mammals and insects from Gondwana to the Northern Hemisphere. Scientists trace origins of India’s tigers, elephants and other large mammals 2013-09-02T22:19:00Z Scientists recently proposed that the first mammalian Eve, the mother to all placental mammals, lived about 65 million years ago, when dinosaurs went extinct. Tiny Primitive Mammal Unearthed in Japan 2013-03-27T18:45:00.550Z Typically, we think only of the sub-group of mammals like us, the so-called placental mammals. Found: Our Most Distant Ancestor -- Humanity's Great-Grand-Rat 2013-02-08T16:35:27Z From humans to whales to bats, the placental mammals—so named for the placenta that nourishes the fetus during development—are mind-bogglingly diverse. Meet the Last Common Ancestor of Bats, Whales, Sloths and Humans 2013-02-07T22:15:04.750Z They also compared 27 different genes common to all placental mammals. Ancestor of All Placental Mammals Revealed 2013-02-07T19:20:00Z Drawing upside down to make it easier for me to see, he maps out the standard phylogenetic tale for placental mammals. Phylogeny: Rewriting evolution 2012-06-27T17:50:32.213Z "This little critter, Sasayamamylos, is the oldest Eutherian mammal to demonstrate what paleontologists consider the modern dental formula in placental mammals," Davis told LiveScience. Tiny Primitive Mammal Unearthed in Japan 2013-03-27T18:45:00.550Z Between these marsupials and the highest or placental mammals, there occurs “the greatest leap anywhere made by Nature in her brain work.” Pioneers of Evolution from Thales to Huxley With an Intermediate Chapter on the Causes of Arrest of the Movement 2012-04-26T02:00:14.960Z It appears to be the oldest known ancestor of placental mammals, according to a research group led by Zhe-Xi Luo, a paleontologist at the Carnegie Museum of Natural History. Meet Your Newest Ancestor 2011-10-29T12:15:02.487Z To help settle the debate, O'Leary and her colleagues reconstructed the family tree of placental mammals using evidence from a large number of living and extinct species. Ancestor of All Placental Mammals Revealed 2013-02-07T19:20:00Z They have been able to date the origin and diversification of placental mammals, but they are still working to resolve which lineages branched off first — a key test for the phylogenies. Phylogeny: Rewriting evolution 2012-06-27T17:50:32.213Z As with all placental mammals, humans do not use egg yolk as a source of nutrition for their embryos. The Fossils in Our Genes 2011-10-21T18:50:24Z Living mammals are split into three subgroups: the egg-laying monotremes; the pouched marsupials; and, the most diverse of all, placental mammals, which includes everything from humans to bats to whales. 'Jurassic Mother' Found in China 2011-08-24T18:02:00Z Until now, scientists believed that placental mammals first appeared some 125 million years ago. Meet Your Newest Ancestor 2011-10-29T12:15:02.487Z "These new findings call for a reevaluation of the evolutionary story of placental mammals," says Anne Yoder, an evolutionary biologist at Duke University in Durham, North Carolina, who wasn't involved in the work. Ancestor of All Placental Mammals Revealed 2013-02-07T19:20:00Z It is the first time this sense has been reported in a marine mammal—or in any placental mammal. Guiana Dolphins Can Use Electric Signals to Locate Prey 2011-07-27T00:03:00Z Coryphodon is thus, as might be expected in a primal placental mammal, a creature of somewhat generalised type. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z Together, these traits indicate that the forerunners of marsupial mammals—called metatherians—and placental mammals diverged even earlier still and have been separated by over 160 million years of evolutionary change. 'Jurassic Mother' Found in China 2011-08-24T18:02:00Z The issue is contentious because the fossil record suggests that placental mammals did not expand, in terms of the number of different species, until after 65 million years ago. As Dinosaurs Waned and Mammals Rose, the Lowly Louse Kept Pace 2011-04-06T20:07:46Z Human milk is dilute compared to the milk of other placental mammals, but it does contain some surprising ingredients. Development: Mother's milk: A rich opportunity 2011-01-04T22:22:32.713Z But the syncytin genes we use today may have actually replaced an ancestral one that a virus bequeathed to the very first placental mammals. 2010-01-12T05:27:00Z Dogs were also in the possession of the natives of New Zealand and other islands of the Pacific, where no placental mammals exist naturally, on their discovery by Europeans in the 18th century. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" "This puts down a new evolutionary milestone for the origin of placental mammals, which are important because they make up more than 90% of all of the living mammals," Luo says. 'Jurassic Mother' Found in China 2011-08-24T18:02:00Z But the fossil record of placental mammals is reliable and does not record a speciation until later. As Dinosaurs Waned and Mammals Rose, the Lowly Louse Kept Pace 2011-04-06T20:07:46Z And last of all the true placental mammals appear. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed Sloths and their relatives branched off from all other placental mammals about 100 million years ago. 2010-01-12T05:27:00Z The molar teeth being in excess of almost all other placental mammals with a differentiated series of teeth. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" In the class of animals the steps are not difficult to conceive which led from the ancient Monotremata to the ancient Marsupials; and from these to the early progenitors of the placental mammals. Evolution in Modern Thought “The fossil record continues to show that the origin of modern placental mammals postdates or is at the Cretaceous-Paleogene boundary,” he said. As Dinosaurs Waned and Mammals Rose, the Lowly Louse Kept Pace 2011-04-06T20:07:46Z The placental mammals make their appearance, as I have said, in the earliest ages of the great Tertiary division, and exhibit in the group an aspect very unlike that which they at present bear. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed They were already infecting the common ancestor of all placental mammals back when dinosaurs ruled the Earth. 2010-01-12T05:27:00Z In higher, true, placental mammals the period of pregnancy is much longer, and the young are born in a far higher stage of development, or rather, growth. The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 We start from the undisputed fact that man is in any case—whether we accept or reject his special blood-relationship to the apes—a true mammal; in fact, a placental mammal. The Evolution of Man — Volume 2 Such evidence as there is seems rather to suggest that South Africa was the cradle of the placental mammals. The Story of Evolution We may provisionally conceive the placental mammals as a group of the South African early mammals which developed a fortunate variation in womb-structure during the severe conditions of the early Mesozoic. The Story of Evolution The Insectivores also developed some of the present types at an early date, and have since proved so unprogressive that some regard them as the stock from which all the placental mammals have arisen. The Story of Evolution We have reserved for a closer inquiry that order of the placental mammals to which we ourselves belong, and on which zoologists have bestowed the very proper and distinguishing name of the Primates. The Story of Evolution It was an age when the primitive placental mammals were just beginning to diverge from each other, and had still many features in common. The Story of Evolution |
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