Summarize factors that account for the dramatic rise in fraternal twinning and other multiple births in industrialized nations over the past several decades
What will be an ideal response?
Answer: Currently, fraternal twins account for 1 in about every 33 births in the United States. Older maternal age, fertility drugs, and in vitro fertilization are major causes of the dramatic rise in fraternal twinning and other multiple births in industrialized nations over the past several decades—a trend that has recently leveled off with improved in vitro procedures. The rate of fraternal twinning rises with maternal age, peaking between 35 and 39 years, and then rapidly falls. Multiple births occur less often among women with poor diets, and occur more often among women who are tall and overweight or of normal weight as opposed to slight body build. Multiple births are more likely with fertility hormones and in vitro fertilization.
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a. mesosystem. b. exosystem. c. microsystem. d. macrosystem.
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a. ?functionalism b. ?structuralism c. ?introspection d. ?naturalselection
In a two-factor design, there are two separate interactions
a. True b. False Indicate whether the statement is true or false