a complex organism. a microorganism. an organism with specialized cells. an organism with different types of tissues.
I gave my students this multiple choice question: A unicellular organism is best described as being

Only one answer is correct among these 4 choices:
- a complex organism.
- a microorganism.
- an organism with specialized cells.
- an organism with different types of tissues.

Could you tell me which one is correct?

a microorganism.