|Class 9 Biology Fundamental Unit of Life||Unicellular organisms|
Unicellular organisms are composed of single cell.
The single cell constitutes the structure and entire function of the organism.
For example, Amoeba found in marine areas or areas of decaying water is a microorganism composed of single cell that determines the shape of the amoeba.
Chlamydomonas is another example of unicellular organism found in marine regions.
Paramecium is also unicellular organism.