Insect melanism is one of the common polymorphism in nature, and has become classical study system for species evolution and adaptability.

昆虫黑化是自然界中普遍存在的一种多型现象，也成为揭示物种在自然界中进化与适应的经典范例。

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Wide hybridization plays an important role in plant species evolution, and one that often leads to new speciation, either through polyploidization or at the diploid level.

远源杂交在植物物种进化上起着重要作用，往往是通过多倍体化或在二倍体水平上形成新物种。

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Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.

缓慢的、持续的变化可能是环境稳定时期的常态，而新物种的快速进化发生在环境压力时期。

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These pictures show young readers what led Darwin to form his great discovery: the evolution of species through natural selection.

VOA: special.2009.02.27

"The human species is about evolution and is about moving forward, " said Eric Anderson, president of Space Adventures Ltd.

CNN: Opening the space frontier, one tourist at a time

That was because his hypothesis was that if linguistic evolution is jerky, the jerks will happen at the points where languages split the equivalent of species splits in biological evolution.

ECONOMIST: Linguistic evolution: Received pronunciation | The

Using informed but clear language, she guides the reader through Darwin's own encounters with giant tortoises, iguanas and finches on these islands in the 1830s that led him, years later, to formulate his theories about the origin and evolution of species.

ECONOMIST: Island life