Health: heart has one way valves which open and close with each heartbeat. A. one B. two C. three D. four

True or false mucous membranes destroy pathogens on the outer body surface, at body openings.

Does the weight loss program have practical significance? a. no, the program is not practically significant because the results are likely to occur even if the weight loss program has no effect. b. yes, the program is practically significant because the results are too unlikely to occur by chance. c. yes, the program is practically significant because the amount of lost weight is large enough to be considered practically significant. d. no, the program is not practically significant because the amount of weight lost is trivial.

Rotation of the head is made in atlanto-occipital joint or not?