The best and most correct answer among the choices provided by your question is the first choice or letter A.
<span>You need to use every note you took, or you have wasted your time to make use of the secondary sources in your research report.</span>
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Burning is a chemical process that involves a substance being broken down and changed into different substances so It is.
For the other question you can determine it by it’s reaction to the heat.
I think its smells I'm not sure tho