Environmental Science
Definition of ecosystem is

The abiotic component of a habitat
A community of organisms interacting with one another
The community of organisms together with the environment in which they live
The part of the earth and its atmosphere which inhibits living organisms

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Environmental Science
Ecology is

Integrates both social and natural sciences to help us understand how the earth works,
The study of the relationships between organisms and their environment
The study of the environment in the absence of humans
The science that studies the evolution of life,

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