Environmental Science
Lead poisoning

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

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Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The earth is closer to the sun in January
The earth is farther from the sun in July
Over 80% of the Southern Hemisphere is covered with water
The sun's energy is less intense in the Southern Hemisphere

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