When you change the amount of a substance, the boiling and melting ) go up b) go down c)become the same temp. d) remain the same

 I want to say that the correct answer is choice C, become the same temperature.

I hope this helps you! :-)

Let's say we're talking about water. The melting point and freezing point of water is always the same (for pure water anyways, if you add salt or some other things it can change) but if you add more water it will just take longer to read the boiling point/freezing point because there's more of it.

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Explanation:

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