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A lack of Vitamin D is said to be detrimental to the maintenance of bone density. If a
scientist wanted to determine whether this view was supported by scientific evidence,
which of the following would be the best method of doing so?
(a) carry out a survey of people with normal bone density to find out whether they
take Vitamin D tablets or not
(b) compare the bone density of two groups of people with low bone density after
providing only one of the groups with Vitamin D
(c) compare the incidence of people with low bone density in two different populations
(d) carry out an experiment in which a group of people with normal bone density are
exposed to very little sunlight to prevent the production of Vitamin D

Sagot :

brittanycandace
i would do B because then you can compare people who do take Vitamin D to people who don't and then you can see who has better bones and the effects. 
D is also a good option because when their little production of vitamin D we can easily determine what is the effect of this experiment to the bone density...
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