Explain what cellular-level organization means. Tell how medusae and polyps are different from one another. Explain what bilateral symmetry is all about. Click here to answer the next question. Explain where the mantle is and what it does for mollusks.
Annelids have bodies that are segmented.
Within the body of the segmented worm are rather elaborate and well developed systems of organs. There is a small brain on the dorsal side of the pharynx that connects to the ventral nerve cord that runs the length of the worm. Earthworms have a clitellum that slips off of the worm and becomes a brood chamber for developing young. Include an illustration with your answer. What are three ways you would be able to recognize an echinoderm if you found one at the tide pools.