Question $16(4$ points$)$

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How can the change in the times of the peak and trough values of light emissions be explained?

Question $16$ options:

Luciferase expression $($that is$,$ light emission$)$ is dependent on external light sources.

The fly$\text{'}$s body detects a change in daytime$-$nighttime hours.

There is random variation in the data.