Food going through the human digestive system (generally) only moves in one direction. However, In some animals, the food goes in two direction and come out of the same opening. In which animals does this happen? Why? Why would this not work for human?

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Solution

Dear student,
Food going through the human digestive system (generally) only moves in one direction. However, In some animals, the food goes in two directions and come out of the same opening.It happens in some animals like cow which are called as the ruminants. They eat cellulose-rich food like grass which has to be properly digested hence they bring their partially digested food back to mouth for chewing it again and than digesting it properly.It cannot happen in humans because humans do not have cellulose-digesting bacteria in their stomach, unlike the ruminants which contain these bacteria for the digestion of cellulose.

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