Hello!!
In the human digestive system, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of saliva.
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When bacteria survived, it will continue to multiply and create more harm which leads to antibiotic (penicillin) resistance. Bacteria create a resistance to penicillin for several reasons. The main and most common reasons for penicillin resistance are; over use or frequent use of penicillin to treat the bacteria and not finishing the prescribed antibiotic course.
Yeah they have :) pretty sure
It occurs because of contraction of the muscle layers. There are two types of muscle found in the alimentary canal; longitudinal and circular muscle, the alternating contraction of these muscles forces the bolus of food through the digestive system.