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'...And now that I have access to the morphic fields, I can implement a change for the better.' [said Bannen.]

'I hate to act the dumb brunette,' Bernice said, 'but morphic fields?'

'An interesting, but obscure offshoot of biology,' the Doctor said, grasping hold of his lapels and leaning forward in his best lecture-room manner as if nothing else were happening around him, 'first put forward on Earth by a scientist named Sheldrake in the twentieth century. The theory states that all living beings have a field associated with them which defines their entire biology, just as an electric field defines an electron. Humans are the way they are because there's a morphic field for humans, just as there's a morphic field for Alpha Centurians and Arcturans and, Rassilon help us, Daleks, and just as there was one for sparrows and for sheep. Morphic fields are reinforced by every successive generation, so that human babies look the way they do because the human morphic field influences the development of the embryo in the womb.'

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Gallifreyans were the first humanoids to evolve in the universe; their morphic field thus made it more likely that subsequent humanoid races would evolve, which is why there are so many humanoid species throughout the universe. According to the Doctor, morphic fields don't follow the normal rules of space and time. The mathematics of morphic fields is too complex for a computer and requires a living mind.

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-10,000,000 (3,512,027,893 BC / ?????)

The first Gallifreyans (one of the first Great Races) evolved. They are the first sentient humanoids to appear in the Universe. As such their morphic fields increase the chances of humanoids evolving on other planets. Morphic fields don't follow the normal rules of the universe and are so complex that that a living mind is required to compute their mathematics.

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And that is why there are so many humanoid races in the universe. The Gallifreyans evolved first, and thus created a morphic field for humanoids. That made it more probable that the next race to evolve would be humanoid, and that made it much more likely that the next race would be humanoid. The majority of the non-humanoid races developed in environments where two legs, two arms and a head would have been a positive handicap.

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Originally posted by CrevanReaver:
Doctor and the rest of his species, the Gallifreyans look like humans. Wonder why, well the answer is that they actually don't. Instead, humans look like Gallifreyans.

A Doctor Who novel titled Lucifer Rising apparently gives an explanation involving morphic fields. Here is an excerpt explaining what morphic fields are:

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The theory states that all living beings have a field associated with them which defines their entire biology, just as an electric field defines an electron. Humans are the way they are because there's a morphic field for humans, just as there's a morphic field for Alpha Centurians and Arcturans and, Rassilon help us, Daleks, and just as there was one for sparrows and for sheep.

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I don't have the novel, all of this I got from the web. If anyone out there has the book Lucifer Rising, please post some more excerpts explaining morphic fields and Gallifreyans.

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