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.
The planet's mass in kilograms are 
b. 
<u>Explanation:</u>
Given:
Mass of Neptune =
milligrams
The mass in Kg = 1 milligram

Then the the planet's mass in kilograms will be:


The planet's mass in kilograms are
.
Answer: "Senegal" is the country farthest west in Africa.
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Hurricanes occur there because of the seasonal patterns.
B does not make sense.
Forest fires are not necessarily a natural event.
Explanation:
It really isn't by age it is tha way the child has been trained and brought up