Once a child has reached phase 4 in the development of attachment, they have developed

Which of the following pairs of individuals shows the highest correlation in IQ scores?

a. an adoptive parent and child b. a biological parent and child c. monozygotic twins reared together d. biological siblings reared together

Chapter 13 discussed research conducted in China on infants' ability to recognize their mother's voice one or two weeks before the infants were born. In one condition, infants heard their mother's voice reading a poem

This research was appropriately conducted because, in the second condition, infants heard a. their mother reading the same poem at a different time. b. their mother reading a different poem. c. another mother reading a different poem. d. another mother reading the same poem.