"有机体说" can be translated as "organismic theory" or "organismic view" in English, depending on the specific context and the emphasis of the theory.
"Organismic theory" typically refers to a theoretical framework that views organisms as integrated wholes, emphasizing their organization, interdependence, and adaptation to the environment.
"Organismic view" is more about a perspective or way of thinking that regards organisms in this holistic manner.
In many cases, especially in academic or philosophical discussions, "organismic theory" might be the more appropriate term to use.