A part of the universe and it's environment that is picked to study is called a(n) ...

A system where mass CAN be lost or gained is called a(n) ...

A system where mass CANNOT be lost or gained is called a(n) ...

A system where energy CAN be gained or lost is called a(n) ...

A system where energy CANNOT be gained or lost is called a(n) ...

A system that is man-made or designed by humans is a(n) ...

A system that is NOT man-made or designed by humans is a(n) ...

A hawk getting nutrients from its food is an example of a(n) ...

Which system is a CLOSED system?

Which system is an OPEN system?

Which system is a DESIGNED system?

Which system is a NATURAL system?

Smaller systems within a system are called ...

Which is a SUBSYSTEM of brushing your teeth?

Pour cereal into the bowl is a SUBSYSTEM for which system?

A system can have only one subsystem.

Open systems can be closed systems.

Closed systems can be designed systems.

Designed systems can be open systems.

Breathing in air and exhaling is an example of a(n) ...

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