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Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo
In 2013, Americans learned that the federal government massively surveys their phone calls and e-mai
Major trunk lines carrying long-distance traffic crisscrossed the area east of the Mississippi. The
Each chromosome consists of a single, long molecule of DNA within which are the sequences of individ
Experiments showing that long- or short-day plants flower in response to night length. Each horizont
Marc’s teacher