compare the scypha, hydra, dugesia  to ascaris and earthworm Do you see a body cavity aside from the intestinal cavity? You may also look at dissected Ascaris and earthworm. Is there a mesentery that suspends the intestine from the body wall in these animals?

Flatworms show bilateral symmetry and some cephalization.   True   False   Some parasitic platyhelminths lost their digestive tract.    True   False   Platyhelminths can remove excess water out of the body.   True   False

11) Turbellarians are free-living worms in Phylum Platyhelminthes. They have a thin, very flat body form. Their body has to be flat because Group of answer choices they need to be able to expand their body when they breathe they need space for their notochord they rely on diffusion across their body wall for gas exchange they do not exhibit any cephalization so this makes them more efficient they have an exoskeleton and they would be too heavy to move if they weren't flat

Describe four different uses for thoracic appendages seen in different crustaceans. Use specific examples (name the corresponding taxonomic group). Relate the morphology of the appendage to its function.