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Coolant in a refrigerator coil is a closed system but not isolated since it likely allows for some leakage of heat with the surroundings. Likewise, a plant can be considered an open system because it allows for the exchange of gases and heat with the surroundings.
A living plant is considered an open system because it can exchange both energy and matter with its surroundings. Its ability to perform photosynthesis and absorb nutrients from soil are examples of energy and matter exchange.
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