Biology, 31.01.2020 11:03, Melymarrupe1345

What is an example of a closed system?
a.) an estuary where fresh and ocean water mix
b.) a living single-celled organism such as a phytoplankton
c.) a river that flows into the ocean
d.) a net constructed along a section of the river to separate the foreign fish species from the rest of the river

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What is an example of a closed system?
a.) an estuary where fresh and ocean water mix
...