Are ants made out of cells?

All living things large enough for you to see are made out of many cells, including ants. Some of the animals and plants that are too small for you to see are made out of just one cell each. Viruses are not made out of cells, but it is a tricky question to argue whether a virus is a living thing or not. For the purposes of this question I suggest you assume that viruses are not truly living things.

This principle that "All living things are composed of cells and cell products" was first discovered and suggested by two scientists called Schleiden and Schwann. It is called the cell theory, and is one of the most important discoveries of modern Biology.