A species is a group of organisms capable of mating and producing offspring. This is another way of saying that a species is reproductively isolated.
Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface.
Answer:
When a population is in Hardy-Weinberg equilibrium for a gene, it does not evolve and allelic frequencies will remain the same for generations.
There are five basic Hardy-Weinberg assumptions: there is no mutation, the mating is random, there is no gene flow, the population size is infinite and there is no selection.
If the assumptions are not met for a gene, the population can evolve for that gene (that is, the allelic frequencies of that gene may change).
The mechanisms of evolution are violations of the different Hardy-Weinberg assumptions: mutation, non-random mating, genetic flow, finite population size (gene drift) and natural selection.
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