The assertion that there are multiple levels of units of natural selection has been used as a way to explain the existence of different levels of biological organization. However these differentiated levels may still be thought from the perspective of the concept of individuation, which also presents gradations. In fact, we consider that the concepts of individual and unit of selection are interrelated, in such way that the stronger the action of selection at a certain level of biological organization the more individuated it will be.
Individuation; Evolution; Units of natural selection; Natural selection; Biological individual