Jean-Baptiste-Pierre-Antoine de Monet, Caballero de Lamarck (1744-1829) fue un prestigioso naturalista francés. Fue uno de los primeros científicos que aceptaron la evolución y que empezó a formular teorías sobre los mecanismos por los cuales los organismos van transformándose.
Lamarck formuló la primera teoría de la evolución. Propuso que la gran variedad de organismos, que en aquel tiempo se aceptaba, eran formas estáticas creadas por Dios, habían evolucionado desde formas simples; postulando que los protagonistas de esa evolución habían sido los propios organismos por su capacidad de adaptarse al ambiente: los cambios en ese ambiente generaba nuevas necesidades en los organismos y esas nuevas necesidades conllevaría una modificación de los mismos que sería heredable.
Esta teoría era más aceptable para la opinión conservadora de
- La existencia, en los organismos, de un impulso interno hacia la perfección.
- La capacidad de los organismos para adaptarse a las circunstancias (el clima)
- La generación espontánea, es decir, que en un determinado medio pueden formarse organismos.
- La herencia de los caracteres adquiridos.
- La función crea el órgano, es decir, las adaptaciones surgen en los seres vivos como respuesta a las necesidades que les impone el medio ambiente.
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