Daniela and Alicia are conducting a systematic observation study on children's aggressive behavior in playgrounds. Daniela concludes that boys display more aggressive behaviors than do girls, whereas Alicia concludes the opposite. Which methodological issue would be of most concern in this study?

In a Canadian study, which of the following groups of children fared least well when cared for by someone other than their mothers during infancy?

girls from low-income families children of African descent boys from high-income families children of French descent

Which lobes are involved in our experiences of touch as well as bodily awareness?

A) frontal B) parietal C) temporal D) occipital