While the first prototype version of ArchEvo had many problems, it was also useful for the beginning of the broader theory of ArchEvo. A few key concepts arose from the experiments that were done there.

There are primarily three types of cells that can exist in ArchEvo:

• Type 0: Type 0 cells are cells that have no reproductive capability. The only fate of these cells is to die, either by being eaten or expending all of their energy. These mostly come from the spawning step of the model, which occurs every iteration with entirely randomized cells.
• Type 1: Type 1 cells have the ability to reproduce, but only following the exact same set of steps over and over. That is, they lack the ability to respond to their environment intelligently.
• Type 2: Type 2 cells reproduce and are able to respond to the environment in order to change their behavior.