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El Origen de las Especies
Paperback
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ISBN13: 9791041934409
Publisher: Culturea
Published: Apr 10 2023
Pages: 410
Weight: 1.61
Height: 0.84 Width: 7.44 Depth: 9.69
Language: Spanish
Publisher: Culturea
Published: Apr 10 2023
Pages: 410
Weight: 1.61
Height: 0.84 Width: 7.44 Depth: 9.69
Language: Spanish
Cuando comparamos los individuos de la misma variedad o subvariedad de nuestras plantas y animales cultivados más antiguos, una de las primeras cosas que nos impresionan es que generalmente difieren más entre sí que los individuos de cualquier especie en estado natural; y si reflexionamos en la gran diversidad de plantas y animales que han sido cultivados y que han variado durante todas las edades bajo los más diferentes climas y tratos, nos vemos llevados a la conclusión de que esta gran variabilidad se debe a que nuestras producciones domésticas se han criado en condiciones de vida menos uniformes y algo diferentes de aquellas a que ha estado sometida en la naturaleza la especie madre. Hay, pues, algo de probable en la opinión propuesta por Andrew Knight, de que esta variabilidad puede estar relacionada, en parte, con el exceso de alimento. Parece claro que los seres orgánicos, para que se produzca alguna variación importante, tienen que estar expuestos durante varias generaciones a condiciones nuevas, y que, una vez que el organismo ha empezado a variar, continúa generalmente variando durante muchas generaciones. No se ha registrado un solo caso de un organismo variable que haya cesado de variar sometido a cultivo. Las plantas cultivadas más antiguas, tales como el trigo, producen todavía nuevas variedades; los animales domésticos más antiguos son capaces de modificación y perfeccionamiento rápidos.
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