Question

a closed system is one that does not receive input from outside the system. for example, the earth is a closed system for matter because the amount of matter on the earth does not change. what is another example of a closed system? a plant releasing oxygen into the atmosphere an unopened jar of peanut butter

Explanation:

A closed - system does not receive input from outside. An unopened jar of peanut butter is a closed system as no matter or energy can enter or leave it easily. A plant releasing oxygen into the atmosphere is an open - system as it exchanges matter (oxygen) with the outside environment.

Answer:

An unopened jar of peanut butter