1) A researcher finds a positive correlation between aggression and sugar intake.we cannot say that sugar intake cause aggresstion level to chage. Explain why. In other word,explain three possible explanation for this correlation( hint : directionality problem, third variable problem).
2) Explain why the myelin sheath speeds transmission of a message within a neuron compared to neurons without a myelin sheath. You can draw a picture to go with your explanation if it helps.