The number is the National Drug Code.
I think the answer is nervous system and muscular system work together but i could be wrong.
Motor Unit Summation<span> - the degree of contraction of a skeletal muscle is influenced by the number of </span>motor units<span> being stimulated (with a </span>motor unit<span> being a </span>motor<span>neuron plus all of the muscle fibers it innervates; see diagram below).</span>
Answer: The 3rd answer
Explanation:
I think that your answer is this because teens are of of school sat sun and Friday therefore they are more likely to drive recklessly ext..
