The roles that sex hormones play in human sexual behavior are not as well understood as in lower animals

Fifteen-year-old Donny can read his math textbooks quickly. His little sister, Marie, also reads her math books, but it takes her longer and she stumbles over some words. Donny is demonstrating greater

a. abstract thinking. b. metacognition. c. hypothetical deduction. d. automaticity

Explanations and predictions concerning phenomena of interest are called _________________, and provide a framework for understanding the relationships among an organized set of facts or principles

a) concepts b) hypotheses c) theories d) perspectives