Swamp is the freshwater ecosystem that is most productive.
What do you mean by Ecosystem?
An ecosystem may be defined as a place or area where members of different species or communities live together and interact with one another for the purpose of food, shelter, space, and other resources.
Swamp has high primary productivity because it aquires nutrient enrichment with high or normal nutrient turnover.
Due to sufficient nutrient enrichment, the organisms are assisted with an unlimited food supply which causes high productivity in the swamp ecosystem.
Therefore, the correct option for this answer is C.
To learn more about the Ecosystem, refer to the link:
https://brainly.com/question/26551655
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