There is no consensus of what actually happens to initiate the onset of labor. it is thought to be a combination of maternal and fetal factors that occur in such a way that labor begins. what is the term used to describe the way maternal and fetal factors interact to cause labor to begin

The missing options are:

a) Pyramid effect

b) Waterfall effect

c) Pathway effect

d) Cascade effect

The correct option is d) cascade effect.

Explanation:

A cascade effect is a series of reactions that happen as a consequence of the previous reaction and that it gradually expands throughout a system. If we think of the cascade effect during labor, we can see that there is an initial reaction that initiates the cascade and continuous during the different stages of labor.

thinking it would be physical characteristics