Abstract

The concept of “organism” has been central to modern biology, with its definition and philosophical implications evolving since the nineteenth century. In contemporary biology, the divide between developmental and physiological approaches and evolutionary approaches has influenced the definition of organism. The convergence between molecular biology and evolutionary biology has led to the term “suborganismal biology,” while the return to the organism has been characterized by animal behavior studies and Evo-devo. The philosophical approach to the concept of individual is divided between a Kantian understanding of organism, which defines necessary and sufficient conditions for any X to be a “natural purpose,” and an evolutionary approach, which considers what a biological individual is and confers natural selection a key role in this definition. While the former aims to find necessary and sufficient conditions for an organism, the latter thinks in terms of conceptual spaces, being much more liberal in pointing out organisms in the world. The paper examines possible connections between these two approaches and assesses the prospects of a reconciliation between them.