Answer: Public health measures such as pure food and water, and development of immunizations against many serious diseases such as polio and smallpox, coupled with enhanced economic conditions, are together credited with substantial reductions in the burden of infectious diseases.
The answer is A because drug tolerance makes it so you have to take more and more drugs to get the effect you want. Meaning you are more likely to do too much to get your high and overdose.
A health risk is something that when it happens, could and/or would be detrimental to your health
I believe the answer would be B because at one years old, children don't have much strength to hold their own body weight. they can't do a pull up, they can't run a mile without resting, and they can't do a cartwheel. remember, children develop as they grow and at one years old, they are still developing. maybe at like 7 or 8 they can do something but besides that, the answer is B.
I hope this helps!
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The muscle cells cause the involuntary reaction
