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The adult are sessile while larvae are motile in the members of the phylum |
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Answer» 28.1A: Phylum Porifera. Sponges LACK true tissues, have no body symmetry, and are sessile; types are classified based on presence and composition of spicules.this means they spend their entire adult life ATTACHED to a single spot. why are sponges classified as animals. because they are multicellular, heterotrophic, have no cell walls and contain a few specialized cells.Advantage of sessile ANIMAL producing free-swimming larvae? To spread and not be CONCENTRATED in just one area. Advantage of reproducing asexually by budding? FORMS sessile clusters from their base. |
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