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 the earth is radiating energy at maximum intensity
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

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Environmental Science
Which one is true?

symbiosis when neither population affects each other
commensalism when none of the interacting populations affect each other
symbiosis when the interaction is useful to both the populations
commensalism when the interaction is useful to both the populations

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