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蚯蚓擅长一分为二？我海葵可以一分为百海葵隶属于腔肠动物门（Phylum Coelenterata）珊瑚纲（Anthozoa），是一类在进化史上较为原始的多细胞生物。 通常认为，腔肠动物门有3个纲，分别是 ...
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