What kind of digestive system does a sponge have?

Question

simple (digestive cavity with cells lining the wall carrying out digestive function)

or

complex (digestive system with specialized organs)

also :

what kind of nervous system does a sponge have??

none (no central nervous system)

rudimentary (with some concentration of

nerve cells and some sensory receptors)

or

developed (with a definite brain, ganglia,

and sensory organs)

Answer 1

it has simple. and it doesnt really have central nervous system. i wish i had my invertebrate book to check. tho it might be rudimentary

Answer 2

digestive system -- simple

nervous system -- none

Answer 3

simple

and again, im not totally sure it may be non because i think most invertebrates dont have nervous systems...or it could be rudimentary