Misc: What Beatles album spent the longest time atop the charts, at 15 weeks?

Questions

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.?

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

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