科学家们对生物钟需求的持久修改能力有限。

Scientists have limited abilities to create durable modifications of chronobiological demands.

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此外，岛屿栖息地的食物资源有限，因此体型较小，对资源的需求较少将受到青睐。

Moreover, island habitats have limited food resources, a smaller body size and a need for fewer resources would thus be favored.

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此外，岛屿栖息地的食物资源有限，因此更小的体型和对更少资源的需求会更有利。

Additionally, island habitats have limited food resources, a smaller body size and a need for fewer resources would thus be favored.

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