Environmental Science
Which of the following helps to explain why even though northern latitudes experience 24 hours of sunlight on June 22, they are not warmer than latitudes further south?

Increased cloud cover reflects solar energy in the northern latitudes
Some of the sun's energy is reflected by snow and ice in the northern latitudes
Solar energy is used to melt frozen soil in the northern latitudes
Solar energy is spread over a larger area in northern latitudes
All of these

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Environmental Science
Which one is true?

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

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