If the Universe started as a singularity, it would mean that started out . all mass and energy, spread out across the galaxy a portion of mass and all energy, in a point all mass but no energy, spread out across the galaxy all mass and energy, in a point

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.