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The cooperative pulling paradigm is an experimental design in which animals cooperate to pull food towards themselves. Researchers use these experiments to try to understand how cooperation works and how and when it may have evolved.

sal rectificadora roca -

beneficio mineral de cromo rectificadora peru. primas necesarias (mineral de hierro, carbón, gasóleo, chatarra y aditivos). .. ciales para usos específicos (p. ej. se les añade cromo para evitar la oxidación ...