Why are Humans still the same?Watch
If you're comparing us to drosophila then you have it very wrong.
Every biology student probably knows what speciation is, same species but due to different environmental conditions, have adapted and adapted untill, the same species are too different that they cannot produce fertile offspring and so inturn become different species. this has happened to many organisms, but why has it ever happened to humans and if it did in the past, how can we still produce fertile offspring?
so that's why we have different eyes, shapes, colors, hairs... etc