Sex change is also controlled by the dynamics and the social interactions of the population (Zohar et al., 1995). For example, when younger males are added in the broodstock at the end of the reproductive season, the older (and larger) ones change sex before the next reproductive season. ...
is thequintessenceof bipedalism. It is a means of traveling during which the energy output of the body is reduced to a physiological minimum by the smooth undulating flow of the progression. It is a complex activity involving the joints and muscles of the whole body, and it is likely that...
themselves came to be the object of thedesignation. By the early 20th century the term embraced a growing range of means, processes, and ideas in addition totoolsandmachines. By mid-centurytechnologywas defined by such phrases as “the means or activity by which man seeks to change or manipu...
aUpdated drawing attached. This length difference will not change price. 附属的更新图画。 这个长度区别不会改变价格。[translate] aOne type of test is sometimes called an objective(客观)test. It is intended to deal with facts, not personal opinions. 测试的一个类型有时称一个客观(客观)测试。 它...
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the idea that animals change and adapt in response to their environment. 即动物随着环境的变化而变化,来适应环境的观点。 In the 1830s he visited the Galapagos, 19世纪30年代,他参观了加拉帕戈斯群岛, a string of islands in the Pacific Ocean 是太平洋上的一片群岛, famous because of the unique anim...
___ ___ is a change in ___ frequencies over time due to ___ breeding by humans; this is a compelling demonstration of the principles of ___ ___; Darwin opened origin of species with a chapter on ___ ___; ___ ___ in the change in ___ frequencies over time due to _...
The lower panels show habitat change plotted through time (change from one time step to the next) and maps in the right panel (0 Ma) show cumulative habitat change over time per sub-basin. Absolute values are meaningless and are omitted. Full size image Changes in habitat resulting from ...
Protists were a dominant form of life on Earth 1.5 billion years ago. While protozoans evolved early and have survived to the present day as unicellular organisms, they have undoubtedly undergone considerable evolutionary change. That many species must have become extinct as others appeared can be...
(where AGE is greater than age at maturity) in datasetdto be drawn from a multinomial distribution, whereθiis a product of the probability of surviving to that age,Li, the effect of population change,Ri, and the effect of sampling bias,Si(equation (1)).Li,RiandSiare defined on the ...