Environmental Science
Which one is true?

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

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

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

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