Which of the following is a characteristic of unicellular organisms?
They can possess tissues and organs
All of their functions are performed by a single cell.
They are usually microscopic.
Each of their cells is specialized to perform a specific function

All of their functions are performed by a single cell.

Explanation:

Unicellular are those organisms whose body is madeup of one cell. In Unicellular organisms one cell perform all the functions and activities of the cell such as respiration, digestion, excretion and reproduction. Unicellular organisms reproduce asexually such as binary fission, budding and fragmentation etc. In Unicellular organisms, a single cell is divided into two equal parts and each part becomes a new organism.

Which of the following is a characteristic of unicellular organisms?

All of their functions are performed by a single cell

Explanation:

Unicellular organisms are made up of one cell which performs all the functions