Answer:
Running changes your body by burning body fat and building muscles. Expect to lose fat at the top of your thighs, build stomach muscles of steal and a butt to die for the weight. ... Running increasing your strength and endurance plus interval training can boost your metabolism.
Explanation:
You can see a physical change always but not always a chemical
The scientist can analyze that data and help other scientists with his research
Your answer should be Polysaccharides
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