An ecosystem is a unit formed by the interactions of all the organisms within a community of plants and animals, and their relationship to the physical environment.
(An ecosystem; is; a unit formed by the interactions of all the organisms within a community of plants and animals) (a unit; formed; by the interactions of all the organisms within a community of plants and animals)
An ecosystem a unit
is formed
a unit formed by the interactions of all the organisms within a community of plants and animals
by the interactions of all the organisms within a community of plants and animals