Which vitamin has been shown to have an important role in wound healing and maintaining healthy gums?
a. calciferol
b. ascorbic acid
c. biotin
d. folic acid

i agree d is most definitely correct!

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.