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Which of the following is an example of an observation?

a.Paraffin wax begins to melt at 57°C.
b.The force acting on an object is equal to its mass times its acceleration.
c.Gases expand as their temperature increases because the gas molecules are moving more rapidly.
d.Will all waxes melt at the same temperature?
e.Three samples of wax are heated to 75°C.

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THE ANSWER TO THE QUESTION IS A
User Bdogru
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