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An organism is a living thing, and there are two broad categories of organisms: those made up of only a single cell, and those made up of multiple cells.

Single-celled organisms means which contains only one cell are called unicellular organisms. 'Uni-' means 'one,' so the name 'unicellular' literally means 'one cell.'

Examples of Unicellular or Single celled organisms ::

Prokaryotic organisms like Bacteria,...

Some algae like green algae, euglena,...

All enzymes are proteins but all proteins are not enzymes since, enzymes are subset of proteins.

The river flows through south eastern parts of former USSR close to the china border and drains into sea of Okhotsk. It is 4510 Km long

Kangaroo.

It is the transfer of sufficient amount of the state of process from one machine to the target machine.

Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium, sulphur and phosphorus.