What are the three major developmental advancements of the earthworm?

Please help!!!!!!!!! I need to hand this lab paper in tomorrow. My lab partner made me do the assignment all by myself, even though we r supposed to do it together!!!!

1 Answer

  1. 1. Closed circulatory system. (dorsal and ventral blood vessels connected by 5 pair of aortic arches).

    2. Segmented body (certain organs are repeated within each segment).

    3. Highly developed digestive system. (compartmentalized for better food digestion).

    4. Well developed muscular system (contains both circular and longitudinal muscles).

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