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_____ these experiments were successfully completed would we think of going into humans.

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Calhoun' s experiment is still considered important today.  Overpopulation causes pathological behavior in rat populations.  Stress does not occur in rat communities unless there is overcrowding.  Calhoun had experimented with rats before.  
arranged  managed   offered  demanded  
although rats are affected by overcrowding, people are not  data from experiments indicate that overcrowding may be an important cause of social pathology  the social behavior of rats is seriously affected by overcrowding  Calhoun' s experiments have influenced many people  
was reduced  has been reduced   were reduced  have been reduced  
cruel, powerful people  people who abandon their children  hyperactive people  people who would like to keep to themselves  
was reduced    has been reduced    were reduced    have been reduced  
when it was double the number that could live in the enclosure without stress  by removing young rats  so that there was a constant number of adult rats in the enclosure  All of the above are correct  
was  were  had been  has been  
concerning    attaching to    involving in    concerning with  
are    is    was    were  
If only    Only if    So that    Even if  
Dominant males had adequate living space.  Dominant males were not as seriously affected by overcrowding as the other rats.  Dominant males attacked weaker rats.  The strongest males are always able to adapt to bad conditions.  

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