Answer:there are no options
Explanation:
Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
Hey there! :D
You cannot control this risk factor. Of the choices, the thing you can't control is your age. You cannot choose what age you are, how your body is developing, your mental stability at a certain age, etc. This is out of your control. You can, however, control how much you exercise or smoke.
I hope this helps!
~kaikers
I think it is also all the above so D
