Environment, the external conditions, resources, stimuli etc. with which an organism interacts (see also habitat and ecological niche).
Natural environment, all living and non-living things that occur naturally on Earth
Built environment, constructed surroundings that provide the setting for human activity, ranging from the large-scale civic surroundings to the personal places
Social environment, the culture that an individual lives in, and the people and institutions with whom they interact
Environmental science, the study of the interactions among the physical, chemical and biological components of the environment
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