The line 
is determined by the points 
and 
.
The line 
is determined by the points 
and 
.
Find a unit vector along the line perpendicular to both 
and 
.
Definitions:
Central Pattern Generator
Neural networks that produce rhythmic patterned outputs without sensory feedback, controlling activities such as walking, swimming, and breathing.
Neurons
Specialized cells within the nervous system that transmit information to other nerve cells, muscle, or gland cells.
Muscle Contractions
The process where muscle fibers shorten or lengthen to produce movement or maintain the position of parts of the body.
Polarized Light
Light waves that vibrate in a single plane, which can be used by some animals for navigation.
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