Define an ecosystem&#151;a system formed by the interaction of living organisms with each other and with the physical and chemical factors of the environment in which they live.
(a system; formed; by the interaction of living organisms with each other and with the physical and chemical factors of the environment) (they; live; L:the environment)
a system they
formed live
by the interaction of living organisms with each other and with the physical and chemical factors of the environment
L:the environment