A1 WHAT IS ECOLOGY? Key Notes a definition of Ecology is the study of the interactions between ecology organisms and their environment. The environment'is a combination of the physical environment(temperature water availability, etc )and any influences on an organism exerted by other organisms-the biotic environmentA1 WHAT IS ECOLOGY? Key Notes A definition of ecology Ecology is the study of the interactions between organisms and their environment. The ‘environment’ is a combination of the physical environment (temperature, water availability, etc.) and any influences on an organism exerted by other organisms-the biotic environment