Illustrative NCEA-style estimate for this synthetic answer.
You build a clear evidence chain from persistence in constant darkness to endogenous control, then use the 15-minute daily drift to interpret the free-running period.
Finish the final fitness link: explain why being active at a favourable time can improve feeding success or reduce risk, then connect that to survival or reproductive success.
The timing mechanism and entrainment are explained well enough for Merit-level reasoning. A complete adaptive link would make the response more integrated and better developed.
Study Sorted