Can divergence occur if no physical barriers are in place to separate individuals who continue to live and reproduce in the same habitat?

如果没有物理屏障将继续在同一栖息地生活和繁殖的个体隔离开来，分化是否会出现？

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Eventually the subpopulations become so genetically distinct that they cannot interbreed even if the physical barriers between them were removed.

最终，这些亚种群在基因上变得如此不同，以至于即使消除了它们之间的物理障碍，它们也无法杂交。

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The researchers think that blinking sets up tiny physical barriers that help to shut off the outside world.

研究者认为眨眼能使当事人建立起一种细微的生理屏障，使其与外部世界隔绝。

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"Let's use this bill to make the physical barriers to disabled access a thing of the past, " he said.

BBC: NEWS | Entertainment | Theatres 'face disability action'

Lynn Jeffries certainly believes the existing political elite needs to change its attitude to remove psychological as well as physical barriers.

BBC: Why aren't more disabled people becoming politicians?

International conventions are an essential tool for protecting marine biodiversity, given the lack of physical barriers in the ocean to confine species to a single zone.

UNESCO: Open Access to Scientific Information