Oesophagus • Boluses of food pass through by
involuntary movements of the longitudinal
and circular muscles, primarily in the digest
tract that occur in progressive wavelike
contractions.

The correct answer is - Peristalsis

Explanation:

Boluses of the food move through involuntary movements of circular and longitudinal muscles known as Peristalsis is, mainly in the digestive tract or alimentary canal. These movements are likes waves or contraction in the alimentary canal.

In the oesophagus, the movement of this series of movements known as peristalsis starts from the top portion of the tube and pushes the food and pushed it into the stomach. 

the sphincter muscles at the end of the digestive tract is the anus.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation: