Hǎimián dòngwù méiyǒu zhēnzhèng de zǔzhī hé qìguān.
Sponges have no true tissues or organs.
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usage
Biology term for phylum Porifera — sessile, filter-feeding aquatic animals. 海绵 alone can mean either the animal or a kitchen sponge; 海绵动物 disambiguates the biological sense. The bath sponge is 沐浴海绵.
