what are ecosystems
An ecosystem is a community of living and non-living things that function together. Within an ecosystem, organisms are interdependent and adapted to the environment. Ecosystems can be as large as a desert or a sea or as small as a tree or a pond. Examples of ecosystems are coral reefs, rainforests, deep seas, deserts, tundra, savanna and urban centers like our cities.
An ecosystem consists of a community of organisms together with their physical environment. Ecosystems can be of different sizes and can be marine, aquatic, or terrestrial. Broad categories of terrestrial ecosystems are called biomes. In ecosystems, both matter and energy are conserved.