Enzymes work the best in certain pH conditions and ranges in regards to base and acidic. If the enzyme is no longer in that range, it could denature(change shape), which would lead to the chemical reaction not working. I hope this is right or helped!
C, because if you are using music to relax, you want music that is peaceful, and that it wont cause singing. The purpose of relaxing is to be in peace and tranquility. dozing off is okay because it signifies that the body is tired and needs to be deeply relaxed.
<span>Hi
HIV weakens the immune system. At a late stage, so it makes the body vulnerable to infections. It is transmitted sexually or through blood, or the pregnant woman to her child.
HIV is different from other viruses because it attacks the immune system, which normally role combat<span>.</span></span>
