Considerable thickening of synaptic connections occurs around the time puberty begins during a process neuroscientists call ____

Similar concordance rates for a given trait in monozygotic (MZ) and dizygotic (DZ) twins suggests that the trait may be due to

a. genetic causes. b. endocrine causes. c. environmental causes. d. phonotypical causes.

Stephen, a pediatrician who hopes to prevent SIDS, is likely to do all of the following except

a. ask mothers who smoke cigarettes either to quit or to avoid smoking around their babies b. encourage cosleeping between parents and infants c. urge new mothers to breastfeed their babies d. explain the importance of back sleeping for young infants