Rivera ECHS
In demographics, the world population is the total number of humans currently living. The world population was estimated to have reached 7.6 billion as of December 2017
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Symbiosis, interaction between two different organisms living in close physical association, typically to the advantage of both. Mutualism, a relationship between two species of organisms in which both benefit from the interaction Commensalism, a type of relationship between two species of a plant,animal, fungus, etc., in which one lives with, on, or in another without damage to either. Parasitism, a relation a relation between organisms in which one lives as a parasite on another.
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