Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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Environmental Science
Lead poisoning

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

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