Because vitamins are so good for us, it is important that we .

a. obtain them only from the foods we eat
b. be mindful not to take excessive quantities of them
c. take large quantities of them
d. spend lots of money buying mega-vitamin supplements

A

Explanation:

Although B is correct, it is a positive question so it needs a positive answer. C, please don't OD on Vitamins. D, that's just a silly answer. So, A is the only answer that really makes sense

what is the aerea shown

explanation:

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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