I have cities but no houses, mountains but no trees, and water but no fish. What am I?Answer: A map..A man shaves 25 times a day and still has a beard. Who is he?Answer: A barber..I follow you by day, grow without eating, and vanish at night. What am I?Answer: A shadow..I have a bed but never sleep, a mouth but never speak, and banks but no money. What am I?Answer: A river..I can fill a room but take up no space. What am I?Answer: Light..I appear once in a minute, twice in a moment, and never in a thousand years. What am I?Answer: The letter “m”.