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PRIMER PARCIAL 

REFERENCIAS

https://books.google.com.mx/books?id=Hdx5ivfiQPwC&pg=PA213&dq=concepto+de+NICHO&hl=Es-

419&sa=X&ved=0ahUKEwi4k9LwhYvoAhVZlnIEHXqJAyYQ6AEIOTAC#v=onepage&q=concepto%20de%20NICHO&f=false

https://books.google.com.mx/books?id=OWwEiL8vGMC&printsec=frontcover&dq=inauthor:%22PARDO+DE+LE%C3%93N+Ma.+Pilar%22&hl=es-419&sa=X&ved=0ahUKEwjykfjJk4voAhXhghg3IEHWJsA4AQ6AEIKTAA#v=onepage&q&f=false

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SEGUNDO  PARCIAL 

TERCER  PARCIAL 

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