To study the potential effects of social isolation on blood pressure, some research participants were instructed to solve problems while working together while others solved problems while working alone. Those who worked alone were assigned to the:

Prolonged stress has been shown to ________ cancer

a. decrease vulnerability to b. be unrelated to one's vulnerability to c. increase vulnerability to d. cause e. increase the metastasis of

The minimum intensity of physical stimulation required to produce any sensation at all in a person is the ______ threshold

a. absolute c. minimum b. difference d. noticeable