Subduction Zone
Regular Member
Diversity is a known factor in genetic analysis. It as also stated that environmental pressure increases the rate of species diversification. So the higher the population pressure, the faster the rate of diversification.
Species diversification is different from diversification within a species. And to have diversity you first need a population. If the population started as only two individuals, say 4,000 years ago there would be a noted lack of diversity. The sort of needed diversity is not caused by population pressures, new diversity comes from mutations. Again, some basic reading:
Population bottleneck - Wikipedia, the free encyclopedia
The observed diversity in most species is proof positive that there was no flood 4,000 years ago.
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