Environmental Science
Which one is true?

commensalism when none of the interacting populations affect each other
symbiosis when neither population affects 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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Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Heat energy from the earth's interior
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface
Conduction of heat upward from a hot surface

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