This text offers a philosophical reflection on the concept of evolution, specifically focusing on the relationship between phylogeny and ontogeny. The author argues that the idea of development remains insufficiently understood. To explain phylogeny, one must assume that individual ontogenies are significantly separated from one another, with each having its own unique beginning and end that cannot be reduced to preceding or succeeding states. In this sense, phylogeny is inextricably linked to the individual as a true event. In contrast, phylogeny itself does not constitute such a true event because it lacks a clear and defined beginning. While a phylogeny can reach a definite end through extinction, this is not considered a proper internal end in the same sense as the conclusion of an individual's life. The abstract highlights the ontological distinction between the discrete nature of individual development and the continuous, ill-defined nature of the evolutionary lineage, emphasizing that evolution must be understood through the lens of individual biological events.