Baby Names Beginning With "U": Meaning: Jewel of the Sea?

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?