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Which of the following is an example of a closed system? A) An estuary where fresh and ocean water mix. B) A chemical reaction within deep ocean organisms allowing them to glow. C) A living single-celled
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Which of the following is an example of a closed system? A) An estuary where fresh and ocean water mix. B) A chemical reaction within deep ocean organisms allowing them to glow. C) A living single-celled organism such as phytoplankton. D) A river that flows into the ocean.

User Phoebe Li
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C) a living single-celled organism such as phytoplankton

User Fraser Price
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