Because most STD (STI)s are bloodborne diseases, and the sexual contact is close enough to blood contact, or are on the genitals.
An abstract presented at this year’s American Academy of Pediatrics National Conference and Exhibition in Orlando revealed that only 11% of children over the age of 12 who were treated for a bike-related injury in Los Angeles County were wearing a helmet at the time of their accident. 57% of bicycle-related fatalities can be prevented by using a protective helmet. Over 135 deaths, 40,000 head injuries, and 20,000 scalp and face injuries suffered by children between ages 4 and 15 can be reduced through the use of bicycle helmets.
My answer is A. hope this helps:/
C.) Vagina is the birth canal
<span>Currently, Drew walks two miles every day every after school, wanting to take changes in his daily routine by taking the workout to the next level, it is therefore suggested that he alternate running and walking. By doing so, he will be able to increase his stamina. This can be done in such a way, for example, he walks 1 mile and run for another. </span>