Which best explains why a wood- burning fireplace represents an open system?
A.)because they are all made of brick
B.)because the ashes have to be swept away
C.)because they can be used for cooking
D.)because a fire requires oxygen from the atmosphere to burn
A.)because they are all made of brick
B.)because the ashes have to be swept away
C.)because they can be used for cooking
D.)because a fire requires oxygen from the atmosphere to burn
