The classic experiments on insightful problem solving were done with chimpanzees by _________

Professor Rashad is interested in studying cognitive development. He collects and compares data from a group of 6 year olds and 10 year olds. Five years later, he compares these two groups to each other again as well as to their own performance in the study five years ago. What type of research design?

a. longitudinal design b. behavior genetics design c. cross-sequential design d. cross-sectional design

The two main divisions of the nervous system are the __________ and the __________

A) brain; spinal cord B) autonomic; somatic nervous systems C) peripheral nervous system; central nervous system D) glands; muscles