First question - all of the above
Second question - puberty ( not quite sure )
The answer to your question is true in the restaurant business the staff turn over rate is really low
Answer:
Fixed-interval
Explanation:
A fixed interval schedule is a term that refers to a type of "reward" when an activity is performed over a certain period of time. In the case given in the question, Leon organizes his studies based on interval programming, where he studies long before the test, but "rewards" himself after the test by studying less after the test.