It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
There's a group on each side so there's equal pull on both sides so it doesn't move
The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed. ... There are attractive forces between atoms molecules, and these become stronger as the particles move closer together
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Explanation: