The

aztec customs of human sacrifices and cannibalism challenged the spanish conquistadors

What is one major role of political parties in u.s. politics

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.

What are the five traits of a civilization?