After seven days of observation, plants growing in darkness become weak and almost die. Those growing in light become longer, stronger and healthier. The light helps in photosynthesis, a process that produces food for the plants.
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Because the tilt of the earth prevents sunlight reaching the far north during the winter months.
There is no such thing as a dark angle, I think you mean Dark Angel, the TV series.
The pattern alternates between groups of 3 circles and groups of 3 squares, with the 3 figures always in the order "dotted, dark, white."
Something pretty muddy... much like caput mortuum
shade or a dark spot