Misc: At the nearest point , Russia and America are less than ____ km apart?

Questions

if your eyes are six feet above the surface of the ocean, the horizon wil be about ---------- statute miles away?

if your mouth were completely dry, you wouldn't be able to ---------- anything?

in a lifetime, we replace our skin approximately ---------- times?

in michagan, usa, a man legally owns his wife's----------?

ingrown toe nails are----------?