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When examining the rates of homosexuality between identical twins and fraternal twins or non-twin siblings, researchers found that if one identical twin is gay, his brother has a ____________________________ percent chance of being gay as well, and if a fraternal twin is gay, his brother has a ____________________________ percent chance of being gay as well. 

____________________________ are habitual targets of displaced aggression. 

Masters and Johnson reported that unlike men, women ____________________________.

_________________________ is an example of a primary reinforcer, whereas _________________________ is an example of a secondary reinforcer. 

What term is used to describe the physical, emotional, cognitive, and behavioral response to events that are threatening or challenging?

The term hassels refers to ____________________________.

AIDS can be transmitted through ____________________________.

The process by which activities are started, directed, and continued so that physical or psychological needs or wants are met is called ____________________________.

____________________________ health psychology is a subfield of health psychology that focuses on using knowledge gained by researchers in the field to help promote healthy lifestyles, help people maintain their health, and prevent or treat illness. 

____________________________ is the optimal amount of stress that people need to promote health and well-being.