Final answer:
An ecosystem is a term that represents the complex interactions between communities of living organisms and their abiotic environment within a specific location, which can greatly vary in size and complexity.
Step-by-step explanation:
A(n) ecosystem represents the interactions of biological communities and the abiotic factors within the inhabited location. An ecosystem includes all the biotic (living) and abiotic (nonliving) components in an area and their interactions. The biotic part, known as a community, consists of all the populations of all species living and interacting in the ecosystem. The abiotic factors may include elements such as temperature, water, sunlight, and minerals in the soil.
Ecosystems can vary greatly in size, from a small tide pool to a large rainforest, like the Amazon Rainforest in Brazil, with each forming complex webs of relationships within a given environment. Relationships in a community are essential, with different types of interactions such as symbiosis, predation, and competition playing a role in natural selection and evolution.