_______ is the study of the relationship between organisms and their environment.
Ecology (from Greek: οἶκος, house, or environment; -λογία, study of) is the scientific analysis and study of interactions among organisms and their environment. It is an interdisciplinary field that includes biology, geography, and Earth science.
Ecosystem ecology studies the flow of energy and materials through organisms and the physical environment. It seeks to understand the processes which govern the stocks of material and energy in ecosystems, and the flow of matter and energy through them.xternal factors such as climate, the parent material which forms the soil and topography, control the overall structure of an ecosystem and the way things work within it, but are not themselves influenced by the ecosystem. Other external factors include time and potential biota.