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The Temperature Began To Rise At The Center Of The Solar Nebula Because

Select one: a.massive stars nearby were heating the nebula with their ultraviolet radiation. b.the nebula was contracting, increasing the speed of motion of the atoms. c.supernova explosions were stirring up the material there and causing turbulence. d.fusion reactions were beginning in the core, releasing tremendous amounts of heat.
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b. the nebula was contracting, increasing the speed of motion of the atoms.

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