Answer:opioid or opium
Explanation:Excessive use and withdrawal of opium or opioids can cause disorders in humans.
I'm not positive but recent scientific studies show that eating 5 grams or more of protein refuses the risk of diabetes and can help spread your metabolism which can help you lose weight.
A vaccination can produce immunity to smallpox
B. testes - the Sertoli cells of the Testes are where sperm mature and the Leydig cells of the Testes generate Testosterone
The vas deferens is a delivery tube connecting the testes to the prostate/urethra for export, and the penis is only a conduit to deliver the sperm inside semen during coitus.
The epididymis only stores mature sperm in preparation for the next ejaculation.