Environmental Science
The blueness of the sky is mainly due to:

Emission of blue light by the atmosphere
The presence of water vapor
The scattering of sunlight by air molecules
Absorption of blue light by the air

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Environmental Science
Lead poisoning

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

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