生物学上,基质(英文:Substrate)指的是生物体在其上生活的一个表面。基质可以包括生物成分和非生物成分。基质是相对的,例如,藻类附着在海底的岩石上,岩石就是藻类的基质。而如果有动物在藻类的结壳上生活,那么藻类就是这种动物的基质。

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