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  1. Fuentes
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  4. Villee, C., Solomon, E., Berg, L. & Martin, D. (1998). Biologia. 4th ed. México: McGraw-Hill Interamericana, S.A., pp.921, 1026, 1027.
  5. Villee, C. (2003). Biología. 8th ed. México: McGraw-Hill, pp.529, 530, 531.
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