Nervous system brain ventral nerve cord-1 -pair 2 wire cord nerve had come closer together as a single line phone with r-lung organs get the feeling many different types in each group.
Nervous System - Brain - 1 Double Cord Ventral nerve nerve cord 2 line, it always comes together as a single line. - R. Call lungs are organs of different categories in each group.
- - brain ventral nerve cord 1 pair nerve cord 2 lines often taste about combined into one - arthropod is วัยวะ feelings several types vary in each group.