Biology / Unit 10 Bio 2239 short lesson, about 20 seconds
"Sponges Aren't Really Animals"
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The idea
Denying sponges animal status overstates a real structural gap: sponges lack tissues and organs but meet every other criterion defining the animal kingdom.
In practice
A sponge develops from a blastula, is heterotrophic, and lacks cell walls, matching the animal-kingdom traits stated at Bio 2213.
Where people slip
This entry states the exclusion misconception; Bio 2241 gives positive evidence for sponges' animal ancestry despite their unusual structure.
Your place on the trail
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