A system that allows energy to move in and out but not mass.
A system that cannot exchange matter with its surroundings A system that allows energy to move in and out but not mass ~ Apex
A closed system does not let any matter enter or exit, and no energy enters or exits the system.
1. A closed system is a system which is isolated so that it cannot exchange matter or energy with its surroundings.
Japanese Americans $$$ APEX $$$
He closed all the banks and only reopened those with enough money.
Amphibians have closed circulatory system Closed
The long term effect of the Stock Market crash was followed by the Great Depression.
closed (apex) ;)
in a closed system, neither the energy or matter changes.
Voting in a CLOSED primary (apex)
Brown bear have a close circulation system
Closed System