The answer is true. They fight things like the flu, but they don't fight bacteria like antibiotics.
The answer would be D. 30s (apex)
The correct answer is D. All of the above. The sit and reach is a type of flexibility stretch that stretches your hamstrings. So obviously it would increase your flexibility and promote circulation. Stretching also helps with preventing injuries (I should know, I am an athlete myself).
Hope I helped!
Knowing how to easily manipulate the people around you. Not exactly a good thing though.
Reusing or sharing needles, really anything that can be spread through blood and drugs.. i hope this helps and sorry its so brief.