Tall Knee

why are black people so tall ? is it because there knee grows?

Think you need to do bit more research..lol.. not all black people are tall, in fact there are some blacks that are extremely short. There is as much variation in the black race as any other race on earth so don't let yourself be pulled into stereo typing anyone. Suggest you stop watching so much TV and start reading.

And knees don't grow they are joints, the long bones of the legs grow and determine leg length.