AP biology Invertebrate Phyla help!?

Question

I need to know if the following phyla have digestive tracts and nervous systems and what types?

-porifera

-cnidaria

-platyhelminthes

-nematoda

-annelida

-mollusca

-arthropoda

-echinodermata

Thanks in advance!

Answer 1

-porifera: Collar cells and amoebocytes; no nervous system

-cnidaria: Gastrovascular cavity; nerve net no brain

-platyhelminthes: Gastrovascular cavity, ladder-like nervous system with a brain

-nematoda: one way digestive system (mouth, intestine, a**s) Circular brain and lateral nerve cords.

-annelida: One way digestion (mouth, pharynx, esophagus, crop. gizzard. intestine)

-mollusca: Same as annelida except for crop and gizzard, Complex nervous system.

-arthropoda: Same as annelida.  Brain and a ventral nerve cord.

Answer 2

no they havent