The answer to this question should be 3. <span>adding research resources during an investigation
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The answer 1 and 2 are similar. Discovering a new variable mean that you wouldn't control it at the beginning of the research. It would be too late if you try to control it. Incorrect measurement definitely will cause an error.
A-14
Explanation:
Mass number (MN) = Proton number + Neutron number
MN=7+7
MN=14
The greater amount is the solvent and the lesser amount is the solute.
Hence ethanol(200g) which is the greater amount is the solvent here.
And water (145g) which is lesser is the solute here.
In my opinion, the correct answer among the choices presented above is option C. <span>A material is nonmagnetic and gaseous and does not conduct heat or electricity. It will, however, react with other elements. It is most likely a nonmetal.</span>
C. soil. If this isn’t C it’s definitely B.