The study of ecosystems is called "ecology." Ecology encompasses the interactions between living organisms, including humans, and their physical environment. This field examines how species and populations relate to one another and to their habitats, as well as the flow of energy and nutrients through ecosystems. Ecologists study various levels, from individual organisms to complex communities and biomes. They also investigate critical issues such as biodiversity, conservation, and the impacts of pollution and climate change on ecosystems. Understanding these interactions is essential for preserving natural environments and promoting sustainability.