BBC3 年
The structure of the digestive system
Food passes through most of these parts in a journey from the mouth ... and nutrients out using the tea towel, just like the large intestine does. Well, okay, the large intestine doesn't use ...
BBC3 年
The structure of the digestive system
Food passes through most of these parts in a journey from the mouth ... and nutrients out using the tea towel, just like the large intestine does. Well, okay, the large intestine doesn't use ...