The composition of the material becomes much more stool-like and much less food-like as it advances. The progression is propelled along by a function know as peristalsis, a wave-like contraction of the bowel.
muundo wa vifaa inakuwa zaidi kinyesi-kama na kiasi kidogo chakula-kama kama maendeleo. maendeleo ni drivs pamoja na kazi kujua kama peristalsis, wimbi-kama contraction ya matumbo.