If you live with someone who smokes, you need extra amounts of this vitamin.
a. vitamin d
b. vitamin c
c. niacin
d. vitamin b12

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.

How can people get cancer? what types of cancer are there? plz i’ll mark u brainliest

Ways in which using health care services effectively can foster your health and ways in which not being aware of them is a health risk.