Libro: Biología Introductoria (CK-12)
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Miniatura: Mariposa monarca (Danaus plexippus), Central Park, Nueva York, EUA. (CC BY-SA; 3.0; Spinus Nature Photography (Spinusnet))
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Miniatura: Mariposa monarca (Danaus plexippus), Central Park, Nueva York, EUA. (CC BY-SA; 3.0; Spinus Nature Photography (Spinusnet))