Willard wants to determine which of two reinforcement schedules is more attractive to rats. He trains a rat to press a lever for food, and then puts the rat into an experimental chamber containing two levers. Pressing one lever produces reinforcement on an FR 10 schedule; pressing the other lever produces reinforcement on an FI 10" schedule. Lever pressing is on a

concurrent schedule

Explanation:

Based on the scenario being described within the question it can be said that Lever pressing is on a concurrent schedule. This refers to a schedule of reinforcement in which the reinforcements are offered to the subject or participant at the same time for their choice. Which in this case since both levers are offered to the rat at the same time it can be considered concurrent reinforcement scheduling.

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average