Answer: The Cells
Explanation: Cells are the smallest living organism in an ecosystem
The cell is the smallest unit of organization in an ecosystem.
The cell function of an animal cell is to perform like a hormone and engage production of energy for the cells
The cell function of a plant cell is to carry out all of the functions necessary for survival.
Animal cells are eukaryotic cells which are surrounded by a plasma membrane. It contains the nucleus and the organelles that are membrane-bound.
Thus,The cell is the smallest unit of organization in an ecosystem.
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