an animal group which lacks nerve cells
PORIFERS have no nervous system so they have no pain what so ever.
And do you know -----
If we grind the sponge and bind it in a cloth and dip in marine water for few days then again sponge will be formed because no nervous system and Cell aggregrate body plan !!!!!!!!!
And do you know -----
If we grind the sponge and bind it in a cloth and dip in marine water for few days then again sponge will be formed because no nervous system and Cell aggregrate body plan !!!!!!!!!