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Earth Science c/o crayfish

  1. there are over 400 species of crayfish in North America.  One species, the Virile crayfish has slowly expanded

each coast to the waters of Montana.  there it encounters the Calico crayfish, whose numbers re now declining.  this is an example of

a.  intraspecific competition

b.  interspecific competition

c.  commensalism

d.  mutualism

e.  none of these

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