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BSD, I've heard the story before...that would take hundreds of thousands of years or more based upon the fruit fly experiment (36,000 man years) for the minor mutation...... millions of years for the DNA changes you are dealing with.
When you talk about a developed vertebrate completely changing major DNA ....when major changes would happen over such a long time...how did the creature adapt to an environment that science says changed rapidly at times.
That depletion of oxygen in the water would have to take millions of years for the postulated adaptation to take place.
You would also have hundreds of thousands of cross over fossils....at least one.
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