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Politics : Formerly About Advanced Micro Devices

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To: J_F_Shepard who wrote (514688)	9/20/2009 11:34:19 AM
From: Brumar89	Read Replies (1) of 1577814

Look at the early embryo's of a chicken and man and you won't be able to tell the difference. They all start out with one fertilized cell and the turn into beings with a head, spinal column, limbs .... why shouldn't they look alike early in the process. After all they both start out as blobs. Did you know at one time school books told children that human embryos recapitulated evolution and passed through fish, amphibian, and reptile stages? What utter nonsense. The theory of recapitulation, also called the biogenetic law or embryological parallelism and often expressed as "ontogeny recapitulates phylogeny" is a discredited biological theory. ..... In 1866, the German zoologist Ernst Haeckel proposed that the embryonal development of an individual organism (its ontogeny) followed the same path as the evolutionary history of its species (its phylogeny). This theory, in the highly elaborate and deterministic form advanced by Haeckel, has, since the early twentieth century, been refuted on many fronts.[2] ...... Modern biology rejects the literal and universal form of Haeckel's theory.[6] Although humans are generally understood to share ancestors with other taxa, stages of human embryonic development are not functionally equivalent to the adults of these shared common ancestors. In other words, no cleanly defined and functional "fish", "reptile" and "mammal" stages of human embryonal development can be discerned. en.wikipedia.org

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