aTrust itself is a risk-oriented construct, which is important in situations where the trusting party is unsure of future actions of the trust-taker 信任是针对风险的修建,是重要的在情况信任的党对信任接受人的未来行动是缺乏信心的 [translate] aAerial Righting, Directed Aerial Descent, and Maneuvering...
THE most recent evidence to shed light on the evolution of flight in birds is described by Sanz et al. on page 442 of this issue — their remarkable discovery of the first example of a preserved alula, or bastard wing, in a 125-million-year-old bird from the Lower Cretaceous of Spain...
THE most recent evidence to shed light on the evolution of flight in birds is described by Sanz et al. on page 442 of this issue — their remarkable discovery of the first example of a preserved alula, or bastard wing, in a 125-million-year-old bird from the Lower Cretaceous of Spain...
For example, feathers and wings likely used for insulation or display in therapod dinosaurs later enabled the evolution of flight in birds (Agosta and Klemens, 2008); (2) the correlated evolution of traits that preadapt organisms to novel conditions. This involves selection for parallel changes ...
3. 飞行(flight) 鸟类能够飞行的原因主要有以下: ①鸟类身体的羽毛(feather),和它流线型(streamline)的外形(appearance)为飞行增加了有利条件(favorable condition); ②鸟类的骨头(bone)是空心的(hollow),它头部和身体特殊的骨骼结构(...
The new fossil documents the oldest known occurrence of connective tissues in association with the flight feathers of birds. Furthermore, the presence of an essentially modern connective arrangement in the wing of enantiornithines supports the interpretation of these primitive birds as competent fliers...
Bird - Feather Evolution, Flight, Adaptation: Feathers are complex and novel evolutionary structures that evolved before birds and avian flight. The evolution of avian flight required decoupling the coordinated movements of the limbs. Major avian diversi
Movements of the wing during upstroke in birds capable of powered flight are more complex than those of downstroke1,2,3. The m. supracoracoideus (SC) is a muscle with a highly derived morphology that is generally considered to be the primary elevator of
百度试题 结果1 题目In the course of _, some birds have lost the power of flight. () A. evolution B. evolve C. revolution D. correction 相关知识点: 试题来源: 解析 A 反馈 收藏
The evolution of flight in birds. This interactive module for grades 9–12 examines evidence from the fossil record, behavior, biomechanics, and cladistic analysis to interpret the sequence of events that led to flight in the dinosaur lineage. http://www.ucmp.berkeley.edu/education/explorations/...