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Piaget called children's self-directed utterances __________ speech, reflecting his belief that young children have difficulty taking the perspectives of others.

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6.1-6.2 Researchers hypothesize that the older a baby is when it begins to crawl, the longer it will take the baby to stop exhibiting earlier rocking behaviors. The researchers go into the infant room of a day care center every day for six weeks. Every time a baby rocks, the researchers record it. They document which babies are already crawlers and at what age each started crawling. What will help the researchers with their investigation?A) sharing the researcher's hypothesis with parents before the study begins B) surveying 100 parents about prenatal careC) their knowledge that babies develop fine motor skills before they develop gross motor skills D) their knowledge that rocking behavior develops before crawling behavior and that rocking behavior eventually goes away once crawling behavior begins E) randomly assigning the babies to crawling versus not-crawling conditions

6.1-6.2 Trinna and Suzanne are identical twins who were the same length at birth. They were adopted by different families at birth and then reconnected in their early thirties. Trinna is two inches shorter and was a severely selective eater as a child. A researcher was conducting an investigation about twins separated at birth. What research method and explanation best fit this scenario?A)A longitudinal study, because heredity is much more important than environment in determining length and heightB)A case study, because environment is much more important than heredity in determining length and height.C)A case study, because both heredity and environment are important in determining length and height.D)A longitudinal study, because environment is much less important than heredity in determining height in early childhood.E)A correlational study, because parents' height levels have little correlation with their c

6.1-6.2 When a newborn infant is touched on the check, the infant will turn its head toward the source of stimulation. This behavior is known asA) rooting B) suckling C) the patellar reflexD) the moro reflexE) the babinski reflex

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