Bob constantly leans back in his chair. His teacher sees this as potentially dangerous. The teacher now praises Bob when all fou
r legs of his chair are on the floor, to reduce leaning back. The teacher is using which procedure? a. Positive reinforcement b. Negative reinforcement c. DRO d. DRI
Smallpox is the only human disease to have been eradicated by vaccination. The last case was in <span>Somalia in 1977 and was successfully eradicated. Now we have been smallpox free for 30 years!</span>
