What describes a ecosystem​

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An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.

An ecosystem is a set of plants and other living organisms ( biocenosis) that are interrelated and that share the same environment with certain physical and chemical characteristics ( biotope). One ecosystem differs from another because of its biodiversity, its climate, and its geography.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.