The Canaanites, having never moved to sunny Africa, were not black, but looked just like other middle eastern people. If the Canaanites had all moved to Sweden after the scattering from Babel, their descendants today would be very fair-skinned. The Jews are a perfect example of this fact. Having been scattered around the world for thousands of years, the Jews now quite frequently look like the people of the country in which they live. Today there are Jews in Israel that have recently migrated from Ethiopia in Africa who are very dark, while the Jews migrating in from Russia are very fair.
Physical size is another variable among the different peoples of the world.
Generally speaking, people of many of the far eastern nations are smaller than people descended from the European and African nations. Perhaps this is because they have historically consumed much less meat in their diets. There have been studies showing surprising increases in the height of Japanese men and women over the last generation due to dietary changes that include more protein. Factors that may effect the physical characteristics of the world's peoples include sunlight exposure, climate, diet, soil content, altitude, activities, lifestyle, and other factors. We did not evolve from separate origins, as many suppose.