Sponges and placozoans have no neurons. But they're more closely related to us than ctenophores, which DO have neurons.This paper says poriferans and placozoans lost their neurons:https://pmc.ncbi.nlm.nih.gov/articles/PMC4650130/This one says ctenophores evolved neurology independently:https://pmc.ncbi.nlm.nih.gov/articles/PMC4334147/
>>16567110arent sponges like universal ancestors? These are just masses of cells, no?They reproduce by just shedding random globs of cells, its a bacteria colonia
>>16567252sounds right. mercy is, on average, the closest planet to all the other planets. and the net velocity of an explosion is zero.still, convergent evolution is pretty cool.
>>16567252Nope, it seems that ctenophores split off before the bilatarian/poriferan split. Ctenophores have nerves, muscles, and all sorts of stuff that sponges don't.
>>16567110It means comb jellies independently evolved them.They also use different neurotransmitters from everything else.
>>16567252>>16567446
>>16567448You don't think its more likely sponges just evolved away from neurons?
