WebDepending on whether sponges or comb jellies came first underpins entirely different evolutionary histories for this organ system. If comb jellies came first, then the last common ancestor of all the animals might have had a nervous system, and as all comb jellies are predators this ancestor might have even been a predator. WebSponges are relatively simplistic creatures. However, comb jellies — possessing complex features, such as a nervous systems, muscles, and guts — are predators that are more anatomically complex. “If ctenophores [comb jellies] diverged first, these organ systems likely have been present in the common ancestor of all animals — and sponges ...
November: Sponges and Comb jellies - University of Bristol
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Is our most distant animal relative a sponge or a comb jelly? Our …
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