By contracting, muscles pull on bones and allow the body to move. Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition
I believe that the answer to the question provided above is that the <span> South african law ensure that people who are living with HIV/ AIDS are not discriminated against, by punishing those people who violate it to serve as an examples for other violators.</span>
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