2. What is the role of motor neurons in the body?
A.
to carry impulses from the sense organs to the brain
to carry impulses from the brain to the muscles
B.
C. to contract in order to move a bone
D. to produce involuntary internal movements

I think is D) to produce involuntary internal movements.  

Explanation:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.