Which best explains why a wood-burning fireplace represents an open system?

Question

Question 3 options:

because the ashes have to be swept away

because a fire requires oxygen from the atmosphere to burn

because they can be used for cooking

because they are not all made of brick

Answer 1

The best explanation for why a wood-burning fireplace represents an open system is:

because a fire requires oxygen from the atmosphere to burn.

An open system exchanges both matter and energy with its surroundings. In the case of a wood-burning fireplace, it takes in oxygen from the air (matter) to support combustion (energy), which demonstrates its open system characteristics.