placental mammals造句
all mammals except monotremes and marsupials are placental mammals.
The modified blastula that is characteristic of placental mammals.
Of or belonging to the infraclass Eutheria, a division of mammals to which all the placental mammals belong.
young of various large placental mammals e.g. whale or giraffe or elephant or buffalo.
"Chorion:The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta."
(embryology) the organic process whereby a fertilized egg becomes implanted in the lining of the uterus of placental mammals.
But the syncytin genes we use today may have actually replaced an ancestral one that a virus bequeathed to the very first placental mammals.
“The fossil record continues to show that the origin of modern placental mammals postdates or is at the Cretaceous-Paleogene boundary, ” he said.
A plausible reason is that all the dinosaurs had been killed off, except the line that evolved into birds, and the placental mammals speciated into the ecological niches that had been left vacant.
monotremes and marsupials are aplacental mammals.
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exposure machine造句
1、Theelementaryexposurepatternofavariablerectangularelectronbeamexposuremachineisarectangle.2、Thenewversionoftheduallanguage"elite"topromote"excellententerprisestopromote",whileincreasingthespecialoffersupermarket,exposuremachineandso...
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1、雷声隆隆:打雷的声音很大声。2、轰雷贯耳:打雷的声音贯满耳边。3、打雷的时候对你说“来我抱着你睡”因为我知道你害怕打雷。4、很想打雷的时候,你那紧紧的拥抱。5、我的猫咪在打雷的时候很容易受惊。6、在打雷的晚上我睡不着觉。7、打雷的时候不要站在树下。8...
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匹妇造句
1、,而不是看他有没有匹夫匹妇的“小人格”。2、非富天下也,为匹夫匹妇复雠也。3、这也就是孔大人口中的匹夫匹妇之为谅也,对否?4、岂若匹夫匹妇之为谅也,自经于沟渎,而莫之知也。5、今日从,明日改,下何所遵?彼匹夫匹妇犹惮失信,况天子乎。6、今日从,明日改,下何所遵?...
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romantic love造句
1、Doyoulikeromanticlovestories?2、oforpertainingtoromanticlove.3、Whenromanticloveisthwarted,theloverjustloveharder.4、Inhisbook"We:UnderstandingthePsychologyofromanticlove,"RobertA.Johnsondistinguisheshumanlovefromromanticlove.5、Thesto...
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