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Since the 1930s, the idea that creatures might advertise their " fitness " as mates through symme...

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It had far - reaching impact on many aspects of the world.  It restructured the social and political systems in many countries.  It reordered the military powers in the world.  Its effect has stretched all the way to today.  
the; 不填      不填; the    the; the    不填;不填  
poem, poetry    poetry, poem    poem, poem    poetry, poetry  
the; 不填       不填; the    the; the    不填;不填  
wrote    witnessed    proved    supplied  
a 1030’s    1930s    the 1930s’    the 1930s
  
were moving    did move   had moved   would move   
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In 1930s    In the 1930s    In the 1930    On the 1930s  
The teaching profession during the baby boom.  Birth rates in the United States in the 1930s and 1940s.  The impact of the baby boom on public education.  The role of the family in the 1950s and 1960s.  
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