Unicellular organisms are composed of a single cell are called unicellular organisms.
Give examples of unicellular animals?
Are unicellular organisms a certain species of their own?
Biology - Unicellular organisms
Organisms that are composed of a single cell are called unicellular
Not all unicellular  organisms are the same. There are a huge number of
ways that a unicellular organism can get food and move around.
A large number of unicellular organisms live in water. Organisms that live
in water are called aquatic.