Which example is a closed system? (1 point)

Question

a sealed jar of salad dressing
the human body
a bowl of punch at a gathering
the atmosphere of a planet

Answer 1

The correct answer is a sealed jar of salad dressing. A closed system is one that does not exchange matter with its surroundings, although it can exchange energy. A sealed jar will contain the dressing and any gases (like air) that may be inside, preventing anything from entering or leaving.