What is an evolutionary bottle neck and what are the consequences?Explain.

TwoParts/Paragraphs:
Readthefollowingarticle:LatePleistocenehumanpopulationbottlenecks,volcanic
winter,anddifferentiationofmodernhumans byStanleyAmbrose
http://www.bradshawfoundation.com/stanley_ambrose.php
Part1:
What is an evolutionary bottle neck andwhatare the consequences?
Part2:
What caused the bottleneck 70,000 years ago? What werethe consequencesto
early humans?

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