Q: The amount of what entering the eyes helps control the biological clock?


Read this paragraph and choose the correct option from the provided answers:

In many species, including humans, circadian rhythms are controlled by a tiny structure called the biological clock . This structure is located in a gland at the base of the brain. The biological clock sends signals to the body. The signals cause regular changes in behavior and body processes. The amount of light entering the eyes helps control the biological clock. The clock causes changes that repeat every 24 hours.

 Choices:

- air

- energy

- heat

- light


A:
light