Leukocytes recognize invading pathogens by their ____________

Arthur was a Navy Seal for decades and was often involved in dangerous missions in Iraq, Afghanistan, and other war-ravaged countries

Arthur is now retired, but each night he wakes up sweating after having intensely vivid dreams of his missions, the suffering and deaths of causalities, and the deaths of his fellow soldiers. Arthur is experiencing a) post-traumatic stress disorder. b) coping skill deficiency disorder. c) loneliness and a lack of social support. d) self-identification difficulties.

The discussion about research on cognitive abilities (Chapter 5) emphasized that

a. gender differences tend to be consistent across different situations. b. frequency distributions typically show a large overlap between the scores of males and females. c. the size of the difference between the average score for males and the average score for females is typically larger than the size of the difference among all the scores for females. d. in general, differences within each gender for cognitive abilities are smaller than they are with social characteristics.