If you are interested, please contact me after class. I think they helped convinced Darwin that there was a logical explanation for the diversity of species. This is no longer disputed by scientists. This mechanism has overwhelming support, but its details have been challenged and are still being debated. Most populations are stable.
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Therefore, there is a struggle for existence among individuals in a population 4. Differences within same genes within a population are referred to as alleles . Most large populations have a stable gene pool - variations are tolerated in the absence of severe 'pressure'. This recognition was advanced by Hardy and Weinberg in 1908 and is known as the Hardy-Weinberg theorem . Pace of evolution remains controversial.