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Biology, 07.01.2020 08:31 millerbe1228
The map shows levels of air quality in parts of the united states and canada. what is a contributing factor to the areas with unhealthy levels?
a) concentration of industrial factories
b) large farming populations
c) exposure to ocean water
d) erosion of beach sand
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The map shows levels of air quality in parts of the united states and canada. what is a contributing...
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