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What if Animal life never diversified beyond sponges. How would the world look with most animal life being Porus. Would Porifera diversify into new sponge like phylum. How advanced could a Porifera based life form get in terms of body structure and intelligence.
My thoughts.
They reproduce sexually so interesting possibilities there.
No central nervous system. This may limit how far they can develop.
Free floating larva could evolve into a non-sessile animal.
IRRC calcium based sponges are closer to Metazons then the two other types.
Specialized sponge cells can transform into any other cell in the body. They are sort of like stem cells.