On This Day: 07 June 1972 German Chancellor Willy Brandt visits ---------- ?

Questions

blood is such a good stain that native americans used it for a----------?

---------- eyes are the most sensitive to light, dark brown the least sensitive?

blue eyes are the most sensitive to light, ---------- the least sensitive?

by age---------- , most people have lost half of their taste buds?

---------- recapitulation is the reason our extremities develop faster than the rest of us?