Ecology is one of the main divisions of biology, the other two being morphology and physiology. The emphasis in morphology is on how organisms are made, in physiology on how they function, and in ecology, on how they live. These divisions overlap broadly.
To appreciate fully the structure of an organ, one needs to know how it functions, and the way it functions, is clearly related to environmental conditions. The morphologist is concerned with problems of anatomy, histology, cytology, embryology, evolution and genetics; the physiologist, with interpreting functions in terms of chemistry, physics and mathematics; and the ecologist, with distribution, behaviour, populations and communities in relation to the environment (ecosystems). The evolution of adaptation and of species is of mutual interest to the ecologist and to the geneticist; bio-meteorology is a connecting link between ecology and physiology; and system analysis inter-relates ecology and mathematics. All areas, in the final analysis, are simply different approaches to an understanding of the meaning of life.