Posttraumatic stress disorder can set in right after a traumatic event

What are some possible explanations for the increase in asthma cases today?

What will be an ideal response?

Which of the following restricts the scientific community's ability to provide a precise and plausible account of developmental change?

a. cross-sectional methods in which investigators examine differences in performance across age groups b. emphasis on Piaget's theory c. unresolved arguments about the origins of knowledge d. none of the above