Answer: Manipulation of the Independent Variable
Again, to manipulate an independent variable means to change its level systematically so that different groups of participants are exposed to different levels of that variable, or the same group of participants is exposed to different levels at different times.
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D is the answer
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Answer:
Great interdependence.
Explanation:
There is a great interdependence between healthy population and its environment because the environment has direct effect on health of people that lives in it. If the environment has pollution so it can causes different diseases and infections in the body of people that lives and expose to that environment while on the other hand, if the environment is clean so it causes good effect on the individuals.
You want to eat well (dark green vegetables, fruits, and various meats.) along side with a consistent fitness schedule that consists of a balanced amount of cardio and weight lifting.
