Bottle is to cork - as jar is to LID.
It's a cork.
Cork is an external, secondary tissue that is impermeable to water and gases, and is also called the phellem. The cork is produced by the Cork cambium which is a layer of meristematically active cells which serve as a lateral meristem for the periderm. The cork cambium, which is also called the phellogen, is normally only one cell layer thick and it divides periclinally to the outside producing cork. The phelloderm, which is not always present in all barks, is a layer of cells formed by and interior to the cork cambium. Together, the phellem (cork), phellogen (cork cambium) and phelloderm constitute the periderm. Cork cell walls contain suberin, a waxy substance which protects the stem against water loss, the invasion of insects into the stem, and prevents infections by bacteria and fungal spores.
Cork for bottles is made from cork trees.
Because the air inside the bottle push out the wooden cork.
The cork
A cork?
push in the cork and then tip the bottle upside-down to get the coin out
The cork over the bottle's neck is going too be pushed by how much air is in the bottle.
A CORK stopper is a plug for a bottle made of cork
It is called a cork cover
the tapered part of a champagne cork before it is inserted into a bottle is like a wine cork cylindrical and uniform