Answer:
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The aspect of his experimental process which is most important for obtaining reliable results is repeating his data collection many times.
No likelihood. Fraternal or identical no twins have the same biological personality.
In the early stages the embryos of four different species will look the same .For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth. That what makes them different.