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the number of people per unit area.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
the abiotic components relating to the physical nature of an area.
an allergic reaction that triggers the immune system causing constriction and inflammation of...
all the different living organisms on the Earth from the smallest micro-organisms to the largest...
teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for...