Would there be any drugs or illegal things ?
Btw plz mark this the brainliest answer ty
        
             
        
        
        
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:
and liver
Explanation:
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The actual answer is D because risk factors are anything that increases the risk of someone getting sick or disease 
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