what are the characteristics of animals in the phylum platyhelminthes?
['Their body is dorsoventrally flattened.', 'They exhibit bilateral symmetry.', 'Also, they are triploblastic, with three germ layers.', 'They do not have a body cavity and are acoelomate.', 'The body is soft and unsegmented.', 'They are mostly parasitic with a few free-living.']