The Testes are responsible for the production of sperm. The Epididymis is the next stage of sperm production and utilization; and is used for storage of sperm. The seminal vesicle, at the end of the Vas Deferens as the sperm is about to be ejected produces a substance that increases the motility of the sperm. The last organ to contribute to the sperm would be the Prostate, which provides nourishment to the sperm
C. the amount of calories
Being inactive can lead to fatty material building up in your arteries (the blood vessels that carry blood to your organs).
I'd say 13-14 years of age... usually when kids are starting high school
