名词
中文翻译：单系理论
同义词：
['monophyly', 'monophyly theory']
例句：
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1.The monophyletic theory posits that all living organisms share a common ancestor.
单系理论认为所有现存生物都有一个共同的祖先。
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2. This monophyletic theory has been challenged by recent molecular studies.
这一单系理论最近受到了分子研究的质疑。
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3. The monophyletic theory is often used to explain the evolution of life on Earth.
单系理论经常被用来解释地球上生命的起源。