Biology / Bio 2239 · Atom · ~20 seconds
"Sponges Aren't Really Animals"
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Denying sponges animal status overstates a real structural gap: sponges lack tissues and organs but meet every other criterion defining the animal kingdom.
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A sponge develops from a blastula, is heterotrophic, and lacks cell walls, matching the animal-kingdom traits stated at Bio 2213.
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This entry states the exclusion misconception; Bio 2241 gives positive evidence for sponges' animal ancestry despite their unusual structure.