The equilibrium of fluids was ascribed by Pascal to the principle of virtual velocities above mentioned. This principle or law of nature has been thus enunciated: “Forces in equilibrium must be ...

In the absence of these evolutionary forces, the population would reach an equilibrium in one generation and maintain that equilibrium over successive generations. The equilibrium for a population ...

The Hardy-Weinberg equilibrium can be disturbed by a number of forces, including mutations, natural selection, nonrandom mating, genetic drift, and gene flow. For instance, mutations disrupt the ...