Thread:User talk:WaitingforGodot/Languages/reply (42)

sponges are INDIVIDUAL single celled organisms that live in colonies, and when in colonies they specialize to different functions. But any one individual cell can be separated from any other cell, and will survive fine on its own, which is a defining characteristic of multi celled animals.

Which is why they are distinct in all of animals as being the link between single celled and muli celled. they are a bit of "both".