If you believe that then you have the same beliefs as the Nazis.
I totally disagree with you. Bodily features yes but the brain no way.
How your brain performs can be very dependent on diet and educational stimuli.
I do not believe that any one race is inherently more/less intelligent and that whatever the circumstances this will not change.
This has been proved time and time again by people who have gone to live in another country and done far better because it has the opportunities their countries do not have.