The correct choice is C 1969 That's when they started to have warnings and mentions the Surgeon General.
;)
Answer: through research.
Explanation:
Answer:
A study now finds that the environment may play a bigger role than genes do in revving up the immune system and shutting it down when the battle is over.
Explanation:
Environmental factors can influence immunity more than our genes do. And as people age, the environment’s impact on immunity grows stronger, the scientists now report.
Suzie is adding to our air pollution problem. Suzie needs to walk.
