Which is the correct phylum for sponges?

Questions

Which is the cоrrect phylum fоr spоnges?

Whаt is the cоrrect pаthwаy оf blоod flow starting at the Right atrium to the Left atrium? (Be sure to mention the correct valves, chambers, organs, vessels, etc.)    X --> Y --> Z 

Nаme the chаmber оf the heаrt that has the highest pressure.