The main organ of the respiratory system is the lungs.
Sit ups is probably the correct answer
The answer is evolutionary!
I hope I was able to help. :)
B. Parkinson's Disease
Early symptoms include muscle rigidity, tremors, and a slowing of voluntary movements. Later, the patient shows a mask-like facial expression, shuffling gait, or inability to ambulate. Treatment: Drugs that increase the amount of dopamine in the brain or drugs that inhibit the action of acetylcholine in the brain.
