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
Platypuses have a closed circulatory system.