Jerry
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Location
Position
Extremes
Endings
Obstacles
Obstructions
Clogs (stoppage)
Bottlenecks
Population Bottlenecks
Attachments
Population bottleneck - Wikipedia
Parents
Bottlenecks
Children
Neolithic Y-Chromosome Bottleneck (2015)
Only 1,280 Breeding Humans Once Roamed Earth, Gene Study Shows