Question

How can something with only one cell be considered to be an organism?

Answer 1

Single-celled organisms are considered organisms because they can utilize energy (ATP), grow, reproduce, and perform basic functions needed to survive.

Explanation:

This answer is quite unprofessional, but it takes a logical standpoint. All organism need energy to survive and carry out basic life functions. Mitochondria in these cells utilize ATP (which are energy molecules) to perform these functions. Even one cell can do this.

All cells can divide. This is widely known as reproduction, and they can fall under binary fission, mitosis, meiosis, etc. These are all types of cell division that help categorize single-celled organisms as living organisms.

This is just a basic overview of why organisms with one cell are considered organisms.