A tree is considered to be a closed system. This is because the veins and roots are all enclosed within the tree's structure.
Closed. Except for the rare case of humans launching objects into space and meteorites striking the planet (which represent an incredibly miniscule fraction of the total carbon), the amount of carbon in the system remains at a constant mass.
The light bulb is a closed system: no mass transfer.
Closed System
Amphibians have closed circulatory system Closed
closed circulatory system
A battery-operated wrist watch is a closed system. A wind-up wrist watch is an open system.
closed
Closed
Closed
closed!
Is the stratification system of south africa closed open or mixed
closed