If an investigator wanted to study the differences in speed of problem solving in young versus old adults, the approach is likely to be

Sharice is pregnant and her pituitary gland has released oxytocin. As a result, ______________

a. she will experience relief from the pain of cramping b. she will experience a euphoric feeling and relief from anxiety c. she will experience failure to progress and is more likely to need a caesarian section d. her uterus will begin regular contractions

The fact that the correlation in IQ scores between identical twins reared apart is higher than that between fraternal twins reared together suggests that intellectual development is

a. influenced more by environmental factors than by genetics. b. affected equally by genetics and environmental factors. c. influenced more by genetics than by environmental factors. d. not affected by either genetics or environmental factors.