Here we apply two such models to phylogenies of non-avian dinosaurs, a clade whose evolutionary history has been widely debated. Although some authors have suggested that the clade experienced a decline in diversity, potentially starting millions of years before the end-Cretaceous mass extinction, ...
Combining both sets of data, we thence inferred the most parsimonious sequence of events that occurred from the diapsid ancestor, to the archelosaur ancestor3, and thence via non-avian theropod dinosaurs to extant birds (see Supplementary Note 1 for divergence times). Studies of the best-...
Dinosauria is a clade of archosaurs that originated in the Late Triassic, about 230 My ago (Langer et al., 2010), and became extinct (except avian dinosaurs) at the end of the Cretaceous period (Brusatte et al., 2015). During their evolutionary history dinosaurs occupied a plethora...
- **C. to be preserved/laid**:不定式to be preserver未完成态不符;laid是lay的过去分词,被动意味不符文意。- **D. preserved/lain**:lain是lie的过去分词,不能单独作为伴随状语。故正确答案为B。反馈 收藏
分析句子结构可知,an embryo和preserve之间为被动关系,第一空故用过去分词;lie和an embryo为主动关系,故用现在分词lying。故选:C。相关推荐 1Researchers who have been working on non-avian dinosaurs were surprised to see an embryo beautifully ___inside a dinosaur egg,___ in a bird-like posture.( ...
分享一篇还热乎的论文,“ The accuracy and precision of body mass estimation in non-avian dinosaurs ”,作者是Nicolas Campione。 相信关注恐龙体重估算的大家对这个作者不会很陌生,他2014年发表的恐龙体重估算公式,是现在应用最为广泛的公式之一。新文章建设性的讨论和评估的在恐龙体重估算中长存的两个思路,体积...
It gives us a much richer snapshot of what life was like in these extinct biological communities. A lot more can be gleaned from fossils such as these Sinocalliopteryx than merely that dinosaurs ate other dinosaurs, especially when related observations from paleontology are brought to bear on ...
Modern birds possess highly encephalized brains that evolved from non-avian dinosaurs. Evolutionary shifts in developmental timing, namely juvenilization of adult phenotypes, have been proposed as a driver of head evolution along the dinosaur-bird transition, including brain morphology. Testing this ...
Implications of limb bone scaling, curvature and eccentricity in mammals and non-avian dinosaurs. J. Zool. 254, 41-55.Carrano MT (2001) Implications of limb bone scaling, curvature and eccentricity in mammals and non-avian dinosaurs . Journal of Zoology 254 : 41–55...
DinosaursOsteocytesEvolution, MolecularPhylogenyCell SizeGenomeBirdsHaploidyAvian genomes are small and streamlined compared with those of other amniotes by virtue of having fewer repetitive elements and less non-coding DNA. This condition has been suggested to represent a key adaptation for flight in ...