Room With No Windows Or Doors

Riddle: A room with no windows or doors, walks in the night, grows in a day, is found where there is death and decay. What is it?

Answer: Mushrooms.

Source: https://www.riddles.com/732

A room with no windows or doors, walks in the night, grows in a day, is found where there is death and decay. What is it? — Room with no windows or doors by Anonymous v1.

Riddle: A room with no windows or doors, walks in the night, grows in a day, is found where there is death and decay. What is it? Answer: Mushrooms. — by Anonymous v2.