As sarah approaches middle adulthood, she maintains a diet high in calcium and exercise because she is concerned about her risk for
a. diabetes
b. rheumatoid arthritis
c. osteoporosis
d. gallbladder disease

c. Osteoporosis

Explanation:

Osteoporosis -

It is the disease which weakens the bone and increases the chances of bone braking .

Osteoporosis is one of the most common reason for a broken bone during old age . The most common bone affected by this are the , spine , hip , forearm .

hence , from the question , Sarah is maintaining a good diet with high calcium concentration and working out , to maintain her bones and avoid the problem of Osteoporosis .

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.