One of the early evidences for evolution, at one time found in almost every school textbook, was based upon the salt content of human blood plasma and the salt content of the sea. Professor Macallum of the University of Toronto began with the assumption that life on earth began in the sea and that the first land creatures had retained that sea salt concentration in their blood. This assumption was then turned and used as textbook evidence that evolution had, in fact, taken place.

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