Answer:
they ensure valid results
Inert
That means it does not react with other atoms
With parents you are not alone and with people you love and chances are have free room and board. However privacy and independence may become contraindicative.
Living alone you can kiss goodbye to room and board, however you have a personal and free life.
Living with a room is the half and half, you are somewhat free and private and you don't go it alone while paying room and board.
Radio waves need a medium to transfer.