Cockroaches are nocturnal insects and are active at night and inactive during the day. You place cockroaches in an experimental chamber which gives you complete control over temperature, relative humidity, and light. Throughout your experiment you keep temperature and relative humidity constant, but you vary light as follows: For the first 3 days, the lights go off at 6 PM each day and come one at 6 AM (a 12/12 light/dark cycle). From days 4-11, you then keep the cockroaches in constant darkness (0/24 light/dark) and you then restore the 12/12 light dark cycle starting on day 12. You measure the activity of the insects and indicate this using the gray bars shown in the graph below:
During the 12L/12D period starting on day 12 through day 14:
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