Answer:
Without this, H2O would just be 2O
What has feet on the inside but not on the outside?
These are needed to finish a test
We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. How can that be possible?
What kind of nail can be grown?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.