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In developed countries, the most common teratogens are prenatal exposure to alcohol and nicotine.

a. true b. false

Your authors report that the research into the effectiveness

of distributed practice has been clear and unequivocal—spreading out our learning over longer intervals is much more effective then cramming our learning into shorter periods of time. This research has been repeated with the same findings over and over again. This demonstrates which principle of critical thinking from your textbook? A) Replicability B) Falsifiability C) Correlation vs. causation D) Occam's Razor