Breeding modern humans

What if some people were put in the sea from birth, and had children in the sea, for several generations. This kind of sea-based evolutionary kickstarter, would presumably lead to a more advanced, semi-aquatic version of the human. Liquid-dwelling humans would be suitable for space flight, and, also, conquering the oceans.

What if some people were put in the africa from birth, and had children in the africa, for several generations. This kind of africa-based evolutionary kickstarter, would presumably lead to a more advanced, semi-nigroid version of the human. Savannah-dwelling humans would be suitable for space flight, and, also, conquering the white countries.