Which laboratory example reflects a fixed-interval schedule of reinforcement? a. A pigeon pecking a disk receives food after four pecks.
O b. A pigeon pecking a disk receives food for pecks after every 6 minutes.
c. Every seventh time a rat presses a lever, it receives food pellets.
Od. A rat receives food for pressing a lever, but the time varies.

What is the difference between a license and a certificate in the healthcare system? a. a certificate grants the freedom to practice, while a license only confirms professional qualifications. b. a license grants the freedom to practice, while a certificate only confirms professional qualifications. c. medical doctors receive licenses, and nurses receive certificates. d. medical doctors receive certificates, and nurses receive licenses. i'll give you 30