Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

Close to 10 percent
About 21 percent
Less than 4 percent
About 78 percent
None of these

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Environmental Science
Lead poisoning

increases O2 carrying capacity of myoglobin in muscles
reduces O2 carrying capacity of myoglobin in muscles
reduces O2 carrying capacity of hemoglobin in blood
increases O2 carrying capacity of hemoglobin in blood

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