(2) Single-celled organisms carry out life functions that are essential for survival.
Explanation:
Unicellular organisms are those organisms which are composed of only one cell. Examples of unicellular organisms are <em>Amoeba</em>, <em>Paramecium</em> and <em>Euglena</em>. These also called single-celled organisms. Unicellular organisms may have eukaryotic cell or prokaryotic cell. In the question, the diagram is of a eukaryotic cell. Since a cell is the structural and functional unit of life, the unicellular organisms perform life processes or life functions such as feeding, digestion, respiration and excretion carried out in one cell for their survival.
