Answer:variable - interval
Explanation: In the this scenario, The humanities instructor is using a variable-interval schedule of reinforcement. The instructor used the word 'surprise' meaning the time and date of the test isn't fixed and the quizzes will come up at unpredictable time intervals. This kind of reinforcement results in a steady response rate as it keeps students on their toes simply due to the fact that they have no idea of when the quizzes are coming up.
<span>The rising and falling of the tides happened twice a day and it would cause the water levels around Jamestown to rise and cause freshwater streams and welts to become brackish or salty. There is evidence that this salty water may have made some early settlers sick.</span>
The title of this famous poem is "The New Colossus".