The ____ is a structure that contains veins and arteries and connects a developing child to the placenta

G. Stanley Hall saw adolescence as a period characterized by ______

a. casual relationships and an easy transition from childhood to adulthood b. a few "bumps in the road," but otherwise relatively calm c. a period of intense, but controlled, personal growth and exploration d. a period of severe "storm and stress," fraught with passion and rebellion

Which of the following is an empirical question?

a) "Would Martin Luther King, Jr., have been a good president?" b) "What is the meaning of life?" c) "Was the Civil War necessary?" d) "Is there life on other planets?"