An evolutionary explanation for the relationship between a face's symmetry and its perceived attractiveness is that
a. asymmetrical faces are less familiar and therefore more distinctive in memory.
b. facial symmetry is associated with biological health and fitness.
c. biological factors have very little to do with facial symmetry.
d. parents devote more resources to caring for offspring with symmetrical faces.
Question 2
Robinson manipulates two variables in his experimental investigation of test-taking performance: the number of participants seated in the room and the room temperature. He finds that regardless of the temperature in the room, participants do better on the test when the room is less crowded. Which statement about this study is true?
a. There are two independent variables in this study.
b. There is one independent variable in this study.
c. There are two dependent variables in this study.
d. There are two dependent and two independent variables in this study.
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