Roles Of Humans On Global Health Of Word's

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Role of Humans on Global Health of World’s Contemporary Ecosystem An ecosystem is a geographic area including all the living organisms (people, plants, animals, and microorganisms), their physical surroundings (such as soil, water, and air), and the natural cycles that sustain them. (Goodenough & McGuire, 2010). All of these elements are interconnected. Managing any one resource affects the others in that ecosystem. Ecosystems can be small (a single stand of aspen) or large (an entire watershed including hundreds of forest stands across many different ownerships) (Audesirk & Byers, 2011). Within each ecosystem, there are habitats. A habitat is the place where a population lives. (Goodenough & McGuire, 2010). A population is a group of living organisms of the same kind living in the same place at the same time. All of the populations interact and form a community. The community of living things interacts with the non-living world around it to form the ecosystem. The habitat must supply the needs of organisms, such as food, water, temperature, oxygen, and minerals.(ibid). If the population's needs are not met, it will move to a better habitat. Two different populations cannot occupy the same niche at the same time, however. So the processes of competition, predation, cooperation, and symbiosis occur . Humans possess the unique ability to modify existing ecosystems, which can greatly upset their natural nutrient cycles. (Audesirk & Byers, 2011). When an ecosystem's natural energy flow has been disrupted by eliminating food sources for other animal populations even the human population can eventually suffer harm.(ibid). Humans clear forests or grasslands to grow crops, later, they build houses on what was once farmland; and finally, they convert small towns into cities. (ibid) Coastal ecosystems are most vulnerable. As these coastal
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