Question

practice it
pattern of fluctuations in bodily processes that occur regularly each day
endocrine system
body temperature
gene expression
auditory system
circadian rhythm

Explanation:

• The endocrine system is a collection of glands that produce hormones.
• Body temperature is one aspect of the body's functioning.
• Gene expression is about how genes are used.
• The auditory system is related to hearing.
• Circadian rhythm specifically refers to the pattern of fluctuations in bodily processes that occur regularly each day.

Answer:

circadian rhythm