What's ecology?

Ecology studies the “factors affecting the density and distribution of organisms”(a good definition of population ecology, but less good for other subdisciplines).

Ecology (from the Greek oikos meaning "house" or "dwelling", and logos meaning "discourse") is the study of the interactions of organisms with each other and their environment. The hierarchy. Define each of the following. species ~ population ~ community ~ ecosystem ~ biosphere Ecology is a SCIENCE, not a sociopolitical movement (e.g., environmentalism). The Ecologist engages in the hypothetico-deductive method to pose questions and devise testable hypotheses about ecosystems. Often, this involves the generation of complex mathematical models to simulate ecosystems. These models represent idealized systems to which real systems can be compared for their predictive value. Sometimes, when a very large scale project is logistically impossible to perform, a computer model is used to predict expected results. (Allee; 1949).

so we can conclude that, The scientific study of the processes influencing the distribution and abundance of organisms, the interactions among organisms, and the interactions between organisms and the transformation and flux of energy and matter. Which emphasizes starting focus on organisms, aggregations of organisms, or systems incorporating organisms. The main thing is study of realtionship of organisms with the other and organisms with their environment.