Evidence that effective treatments for depression inhibit the reuptake of a neurotransmitter links a depletion of that neurotransmitter to mood disorders. That neurotransmitter is

According to the article Wolf in Sheepdog's Clothing , one of the first indications noticed by Shaffer and

Tinbergen suggesting that the dogs had behavior similar to wolves was (a) the way they chewed their food (b) the patterns offoot movement when they were running fast (c) the dominance hierarchies seen in groups (d) the snarling and barking that they did when they saw strangers

In the text we plotted a normal curve. What was the ordinate (the Y axis)?

(a) the median score (b) the correlation coefficient (c) the slope (d) the frequency of people at each score value (e) the validity