It is the set of relationships that fauna, flora, microorganisms (biotic factors) and the environment, composed of the elements soil, water and atmosphere (abiotic factors) maintain with each other. All the elements that make up the ecosystem relate to balance and harmony and are linked together.
Changing a single element causes system-wide modifications that may result in the loss of existing balance. If, for example, a large area of native forest in a given region is replaced by the cultivation of a single type of plant, the food chain of plant-eating animals as well as those that feed on them can be compromised.
The delimitation of the ecosystem depends on the level of detail of the study. For example, if we want to study the ecosystem of a garden bed or the ecosystem present inside a plant like bromeliad.