A. organ
B. system
C. cell
D. tissue
Correct Answer:
Option C – cell
Explanation
In unicellular organisms, the single cell performs all life functions. Examples are Amoeba, Euglena Life can be organized into several different levels of function and complexity.
These functional levels are: cells, tissues, organs, systems and organisms. Every living thing is made up of a cell or a number of cells.
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