________ theory posits that relationship satisfaction is determined by people's perceptions of costs and rewards, their beliefs about what kind of relationship they deserve, and their estimated chances of a better alternative relationship

Girls menstruated at an average age of 16 in the nineteenth century, but today some girls reach menarche as early as age 9. This phenomenon is called the _____ trend.

A) pubertal B) spermarchal C) secular D) menarchal

Which of the following terms is used to refer to the time of onset of the first menstrual period?

a. classical menorrhea b. menarche c. amenorrhea d. secular menorrhea