Question

both peristalsis and segmentation move food forward in the digestive tract, but segmentation also causes:
a solidification of food particles
b thinning of food particles
c removal of food particles
d mixing of food particles

Explanation:

Peristalsis is a wave - like contraction that moves food forward. Segmentation is a back - and - forth movement. It not only moves food (like peristalsis in a general sense of forward movement in the digestive tract) but also has the function of mixing food with digestive juices. There is no process of solidification (A) in normal digestion in this context. Thinning (B) is not the main function of segmentation. Removal (C) is more related to processes like defecation rather than the role of segmentation.

Answer:

D. mixing of food particles