What physical feature blocks access to the indian subcontinent to its north and northeast? a. the himalaya mountains b. the hindu kush mountains c. the deccan plateau d. the thar desert.

Which of the following  bestillustrates a negative reinforcer?               a.  copland gives up candy to stave off chronic acid indigestion.    b.  nancy learns that she prefers chocolate over vanilla.    c.  carmine changes his major to english lit after failing a math exam.    d.  on a hot day, lindberg always drinks lemonade.