let's go back to term endosymbiosis to understand the role of each of these cells. You may remember that symbiosis is a close ralationship between two different organisms. In this case, we are looking at the relationship between several ancient cells. The cell that ate the other cells is called the host, while the other two - respiration and photosynthesis cells - are endosymbion because they live within the host, It may sound like the only one benefiting. While the lazy cell now has a source of energy and a way to convert that energy, the other cells have a safe place to live and grow.