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ecosystem An ecosystem is an ecological unit that encompasses the total aspect of the physical and biological environment of an area and the connections between the various parts. It is an integrated unit consisting of a community of living organisms, affected by various factors such as temperature, humidity, light, soil, food supply, and interactions with other organisms, as well as the nonliving environments, including matter and energy. Changes in any part of an ecosystem are likely to result in changes in the other parts. Relationships between organisms in an ecosystem depend on changes in the energy input and flow and nutrient flux within the system. The term was coined in 1935 by British ecologist Arthur Tansley (1871-1955).
One of the principal ideas of the ecosystem concept is that living organisms interact in complex ways with their local environments, and change in one part of the system can cause changes in another. There is an overall flow of energy in ecosystems that includes exchange of material between living and nonliving parts of the system. In this way all species are ecologically related to each other, as well as with the abiotic constituents of the environment. Ecosystems are similar to biomes, which are climatically and biologically defined areas with a distinctive community of plants, animals, and soil organisms.
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Preparing for Armageddon, Natural Disasters, Nuclear Strikes, the Zombie Apocalypse, and Every Other Threat to Human Life on Earth. Most of us have thought about how we would handle various types of scenarios that could signal the end of the world. There are plenty of movies on the subject, psychological papers, and even survivalists that are part of reality TV shows. Perhaps you have had dreams about being one of the few left and what you would do in order to survive.