Answer:
The increasing demand for health care by people born between 1946 and 1964 has created more health science careers.
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D, because if you don't smoke but you eat junk you would still be unbalanced and if you don't work out your going to be large so its all of the above
Scientists are creating vaccinations that prevent people from getting bird flu. If the virus mutates, a new vaccine needs to be made. The vaccine needs to be tested, which can be dangerous. It also takes a long time for scientists to know whether the vaccine works.
