Answer:
I would probably say (a) kinetochore microtubules
The brain's suprachiasmatic nucleus regulates the body's circadian rhythms. The suprachiasmatic nucleus is a minute region of the brain located in the hypothalamus above the optic chiasm, the circadian rhythm is the 24-hour cycle of organisms, related to sunlight and temperature.
It’s B because accordin to the Law of Conservation of Energy, energy cannot be created or destroyed. However, energy can transform and be conserved.
