Answer:
The correct answer is option A.
Explanation:
A circadian rhythm is a roughly day-night cycle or 24 cell cycle in the physiological processes of living organisms, including animals, plants, cyanobacteria, and fungi. These cycles are endogenously manufactured, although they can be influenced or effect by external hints such as temperature or sunlight.
The discoveries found that drosophila and Neurospora models have suggested the mechanism of circadian cycles and their importance to biology and disease are influenced by genetics and certain genes such as clock gene.
Thus, the correct answer is option A.
