For our motor commands to travel toward our muscles, the signals must travel on for our motor commands to travel toward our muscles, the signals must travel on the primary visual cortex projection fibers commissural fibers association fibers

Answer;

-projection fibers

Explanation;

-For our motor commands to travel toward our muscles, the signals must travel on projection fibers. Projection fibers descend from brain toward the spinal cord.

-Projection fibers consist of both afferent and efferent nerve fibers that couple the brain with the spinal cord. They are myelinated nerves that are arranged in columns within the white matter surrounding the gray matter.

-Projection fibers connect the cerebral cortex to the brain stem and spinal cord.

i thinking chemical change

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this