No, population and organism are not the same thing. Here's the breakdown:

* Organism: A single living being, like a human, a tree, or a bacterium. It's a complete individual.

* Population: A group of organisms of the same species living in a particular area and capable of interbreeding.

Think of it this way:

* You are an organism.

* All the humans in your city make up a population of humans.

So, population refers to a group, while organism refers to an individual.