function takeQuiz(){
  var score = 0; 

  //question 1
  var dogsAnswer = prompt('Do dogs make good pets?').toLowerCase();
  if ( dogsAnswer == 'yes' ) {
    score = score + 1;
  }
  alert('Dogs make great pets!');

  //question 2
  var birdsAnswer = prompt('Do birds make good pets?').toLowerCase();
  if ( birdsAnswer == 'yes' ) {
    score = score + 1;
  }
  alert('Birds make great pets!');

  //question 3
  var gatorsAnswer = prompt('Do alligators make good pets?').toLowerCase();
  if ( gatorsAnswer == 'no' ) {
    score = score + 1;
  }
  alert('Alligators make terrible pets!');

  alert('Thanks for taking the quiz. You got ' + score + ' answers correct!');
}