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The best example, from the choices given here, of an open system is a car engine. All of the other examples are of closed systems. The correct answer is B.

Answer: a car engine

Explanation: An open system is one in which both mass and energy can be exchanged with the surroundings.

A closed system is one in which only energy can be exchanged with the surroundings.

An isolated system is one in which neither mass nor energy can be exchanged with the surroundings.

A) an insulated gas cylinder is an example of isolated system.

C) Our universe is an example of closed system.

D) A greenhouse is an example of closed system.

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