What two factors are thought to underlie the secular trend in which the age of menarche dropped from about age 16-17 to age 13 between the 1840’s and the 1960’s in several Western nations?
What will be an ideal response?
Answer: The secular trend is thought to be due to a reduction in the effects of disease and improved nutrition over this period of time.
Psychology
You might also like to view...
Abscissa is to ordinate as
a. vertical axis is to horizontal axis. b. horizontal axis is to vertical axis. c. measure of central tendency is to frequency distribution. d. frequency distribution is to measure of central tendency.
Psychology
According to Descartes, the mind a. is the product of neural activity
b. exists in both human and non-human animals. c. forms an indivisible whole with the body. d. is not a physical entity that can be studied.
Psychology