Nervous System
https://docs.google.com/document/d/1OoUa4iH7qWpwbqJz07yD4sf2LJR119N1_2mfuQJ69Tc/edit?usp=sharing I learned that the worm cannot hear because they do not have an auditory nerve. Worms also don't have a spinal cord but a frog, orangutan, and human do. Frog have less spinal nerve than orangutan and human. A human has a better-developed brain than the orangutan.