 To capture these ideas, it is useful to think of the feature that Queller and Strassmann believe is definitive of biological individuals as the internal ratio: it is the ratio of the level of cooperation between internal parts of individuals to that of the conflict between them. The higher this ratio is, the higher the degree of individuality. Figure 7a indicates that, relative to other groups of cells, a mouse will have a relatively large internal ratio, while a yeast floc will have a relatively small internal ratio. 