A class wants to use marbles in a clear shoebox with a lid to model the particles in a solid, a liquid, and a gas.

Describe how you would model the motion of the particles in each state.
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The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations