Amoeba is a primitive single celled organism.
Microorganism
If a single cell is living on its own it is called a single-celled organism. There are millions of single-celled organisms alive today.
single unicellular creature
A single cell organism is also called a unicellular organism. These organisms consist of only one cell that performs all necessary functions for life. Examples include bacteria, archaea, and some types of protists.
these are called so because micro organisams used for their production are unicellular ( comprising whole body of one cell)
ALIVE
protists
cell culture
The single cell formed when a sperm fertilizes an egg is called a zygote.
A group of cells that is cultured and originates from a single cell is called a colony.
Haloid cells