Regular feelings of hunger are an example of a(n) rhythm.

The answer is Biological

Explanation:

The word rhythm refers to movement, sounds or similar that mark or regulate a certain element, which is commonly used in arts such as music and literature in the case poetic rhythm. However, this term has been also applied to other fields including biology, in which the rhythm called biological rhythm refers to a natural cycle or rhythm that occur in organism and that is linked to other function in the body, this includes function such as sleeping during the night, eating or feeling hunger every certain time, changes in blood pressure and hormone levels, among others. Therefore regular feelings of hunger are an example of a "biological rhythm" as this function occurs every certain time, which means it is part of a constant cycle and also regulates other functions in the body such as getting energy.