Gravitational.....................
The reason why stars does not die when it is there time is because they tend to fuse in different and more heavier elements. In that way, it prevents them from dying for they were able to have the components of different elements, extending their lives and prevent themselves from dying on the time that they were supposed to.
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The correct answer is:
C. Hypothesis
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You could put salt-crystals outside during different times of the day when the temperature drops or rises.
