What tans the skin to protect it from the burning rays of the sun?

Patrick is jumping rope to trade for his next boxing match. he learned the correct way to jump rope when he was a member of his schools wrestling team. which training principle does this scenario represent

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.

Areligion or cultural has specific values. what are these known as? a. universal values b. intrinsic values c. extrinsic values d. group - specific values