Worms Flatworms Bilateral symmetry No coelum Has organs & systems 3 body layers Ectoderm Mesoderm Endoderm Gasses pass in/out by diffusion Anterior end w/ mouth Primitive…
Slide 1 Chapter 33 Animal Tissues & Organ Systems Tissues Remember our levels of organization/complexity! AtomMoleculeCellTissueOrganOrgan System Cytology—Study…