The answer would "B"
Hemorrhage is the medical term for significant and potentially life threatening bleeding, which is usually not something particularly common as a sporting injury.
Arthritis is actually prevented by constant sporting activities and is more degeneration as a result of old age.
For preventing stds use a condom birth control or abstinence
Cell are important to the body because cell are the building blocks of life that help the human body function ex muscle, Skelton eg
Skin, Voiding, Sneezing, Coughing, Vomiting, Stomach Juices, etc. So many things! :) (even your saliva)
