Explain why cellular respiration can be considered a spontaneous reaction. Does it build polymers or does it break them down?

In short, Cellular Respiration can be considered spontaneous because it releases energy (negative enthalpy) and becomes disordered (positive entropy)

A spontaneous reaction is a decrease in enthalpy ans an increase in entropy.

Entropy is energy release from a system when an event takes place.

The purpose of cellular respiration is to release energy from glucose so that organisms can use that energy.