Home > MCAT > MCQs > Animalia Animalia 1. Animals that have their body cavity filled with parenchyma mesoderm areacoelomatescoelomatespsudoacoelomatesproacoelomates2. Round worms belong to phylumAnnelidaCnidariaArthropodaNematoda 3. Submit Leave a Reply Cancel replyYou must be logged in to post a comment.