Sycon is a sedentary aquatic animal which has pores on its body and has a complex canal system.
Radial symmetrical organisms are those which symmetrical like a pie, i.e, it had many cutting edges which divide the organisms into equal pieces. For example, jellyfish and starfish.
Tapeworms have flame cells in their body which help them filter food and works as the kidney.
Prawns have hemocoel in their body.