Explanation:
Last week, my cousin Jerry went scuba diving for the first time. He left Belize city at 7 a.m. ,went by boat to Glover's Reef and then took another boat to the diving spot. He was amazed by the living corals, the crabs, the sea urchins and the lobsters. The dive company according to Jerry was excellent, and he saw fabulous multicoloured fish of all patterns shapes and sizes. However, he says that he won't be goimg again. He is worried that his visit, brief though it was, may contribute to the destruction of this magical underwater world
 
        
             
        
        
        
Answer:
OMG so many questions Like I DoN't even Know why I'm reading this
 
        
             
        
        
        
The answer is : the introduction
        
             
        
        
        
Answer:
- Variable interval.
Explanation:
'Variable interval' schedule is demonstrated as the schedule in which a particular response or action is after an uncertain period of time which could be few hours, day, a week, etc. in order to reinforce a particular behavior or response. 
In the given example, I('you' in the example) is studying as the pop quiz can be taken any time throughout the class which exemplify the 'variable interval'. <u>The 'variable interval' has been employed for free-operant conditioning to reinforce a specific behavioral response(studying) through inconsistent rewarding schedule.</u> Therefore, <u>'variable interval'</u> is the answer.