Answer:
The children are experiencing natural reinforcement.
Explanation:
Sandra's children are very successful in school and that is a stated natural reinforcer.
Natural reinforces occur as a result of their behavior without involving others expressing their approval of their behavior.
Sandra is trying to foster this natural reinforcement with positive social reinforcement, "but she does not always remember".
Answer:
A bacterial infection usually spread by sexual contact that starts as a painless sore.
Syphilis develops in stages, and symptoms vary with each stage
