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14 October, 20:36

Which of the following is an example of a closed system?

An estuary where fresh and ocean water mix

A chemical reaction within deep ocean organisms allowing them to glow

A living single-celled organism such as a phytoplankton

A river that flows into the ocean

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  1. 14 October, 22:05
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    The answer for the given question above would be the second option. The one that is an example of a closed system is a chemical reaction within deep ocean organisms allowing them to glow. By definition, a closed system is a system that doesn't exchange any matter with its surroundings. Hope this answers your question.
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