Teacher Zhang said that there must be two people in Beijing with the same number of hairs. Do you think what teacher Zhang said is reasonable? Why?

Human hair is slightly different according to race and hair color. The yellow race is 654.38+ 10,000, the blonde is 654.38+2,000, and the red hair is 80,000-90,000. In childhood, the hair on the top of the head is the most charming, while the temples on both sides are slightly thinner.

(1) The amount of hair after birth is fixed, and it is impossible to grow any more in the future.

(2) The color, shape, curl and thickness of hair are controlled by heredity, which varies with races and individuals.

There are about 654.38+ million in Beijing, and there are more than one million, maybe more than two, hehe.