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24 June, 23:16

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.

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  1. 25 June, 01:00
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    C) a living single-celled organism such as phytoplankton
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