A pigeon is confronted with two disks, one green, the other red. The bird receives food on a VI 20" schedule when it pecks the green disk, and on a VI 10" schedule when it pecks the red one. You predict that the bird will peck

How has congress added to the president’s role as chief economic planner over the years?

On the map above, what is the name of the island to the west of letter b?

Which of the following statements about the shang dynasty’s system of writing is false? a. no evidence of the writing system has survived. b. the shang often wrote on bamboo parchment. c. the writing system had over 3,000 characters. d. the writing system developed from a system of pictographs.