Which of the following from Chapter 1 is a construct?

In about 1 in ______ conceptions, the zygote splits completely apart to create a multiple birth

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How might adolescents' tendency to engage in such risky behaviors as street racing and experimental drug use reflect brain development phenomena?

a) The corpus callosum is still developing during adolescence, impeding communication between the two hemispheres of the brain. b) The left hemisphere matures more slowly than the right, delaying the development of logical thinking abilities. c) The prefrontal cortex matures slowly, retarding adolescents' ability to control their impulses. d) The limbic system does not develop fully until early adulthood; adolescents therefore have a poor understanding of their own emotions.