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Una especie de pájaro del hemisferio norte tiene un pico con sus mandíbulas cruzadas hacia la derecha o hacia la izquierda, lo que le permite abrir las piñas de las coníferas y alimentarse de las semillas. Pero no se observa ningún ave de la especie con el pico sin cruzamiento de las mandíbulas. ¿Qué tipo de selección natural ocurre?
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Una especie de pájaro del hemisferio norte tiene un pico con sus mandíbulas cruzadas hacia la derech...
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