Find reliable reference information to help answer these QUESTIONS about the body reversal response in Lumbriculus:

1)  In the animation, if the middle of the worm's body is the center of a 360-degree circle, how many degrees does the head of the worm (shown in red)  shift after it has responded to the head touch?
2)  Of what possible benefit could such a response be to the worm?


RELATED LINKS: 

Those Wonderful Worms Helical swimming in Lumbriculus
Recent article about Lumbriculus swimming and reversal
 

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