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Environment can have several meanings. It can refer to the surroundings or in which live, hence the organism's environment. So for a marine organism the environment would be that part of the ocean in which it lives.
In a larger sense, the environment comprises all and things that occur naturally on .
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Time range (Earth): -
The natural environment, can thus refer to any environments that is not the result of human activity or intervention, including the , , , , etc as a whole. Of course for some 4.5 billion years these were the only environments on Earth.
As far as living organisms go, there are at least four or five types of environment [1]:
To these can be added
- populated by organisms (such as and called ""; e.g. anoxic, exceptionally hot or cold environments, or deep within the Earth's .
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Time range (Earth): -
Within a very tiny slice of time (constituting the second half of the Holocene, from about 5000 years ago or so until now) there has occured the human-made environment (agricultural, urban) which has progressively modified all the natural environments. There is also the concept of the cultural environment (which is included under the ).
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[1] The Cambridge Encyclopedia of Life Sciences, ed. Adrian Friday & David S. Ingram, Cambridge University Press 1985.
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MAK061107 (a bit of material from )