The movements that propel the food particles through the digestive tract are called

select one:

a. peristalsis
b. churning
c. absorption
d. locomotion

Peristalsis is the movement of particles through the digestive tract

The independent variable is what will change. The dependent variable is what will change because of the independent variable. The controlled variable is what will stay the same.
Ex, for the first one.
IV: the amount of sunlight
DV: plant growth
CV: pea plant

For #2.
IV: the soda
DV: the amount of sugar
CV: soda

And so on