While middle childhood is a healthy period, more than ____________ of children are likely to have at least one serious medical condition over this time period

Evidence from twin studies points to the idea that sexual orientation is

a. biological (heredity or brain based). c. social learning theory. b. psychodynamic explanation. d. due to a lack of parental involvement.

The incentive-sensitization theory of substance dependence considers

a) cravings for the substance and the pleasure that comes with taking the substance. b) the extremes a person will go to obtain the substance. c) the age of a person when they first use the substance. d) how much a person likes the substance.