Environmental Science
During the winter solstice in the Northern Hemisphere:

At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
All of these
The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere

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Environmental Science
Which one is true?

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

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