Environmental Science
The earth's radiative equilibrium temperature is:

The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which rates of evaporation and condensation on the earth are in balance
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which the earth is radiating energy at maximum intensity

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Environmental Science
Lead poisoning

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

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