No, not all organisms are made of cells. There is a category of life called viruses that are not considered to be cellular organisms.

Here's why:

* Viruses lack the essential components of a cell. They don't have their own cellular machinery for metabolism, reproduction, or other fundamental life functions.

* Viruses are obligate intracellular parasites. This means they need to infect a living cell to reproduce and carry out their life cycle.

While viruses are not considered "living" in the same way as cellular organisms, they are incredibly important in biological processes and can have a significant impact on ecosystems and human health.