Peyer's patches are found on the ileum in

All of the following are the parts of the large intestine,except:

In rabbits, the reverse flow of food from the stomach into the esophagus is prevented by:

The epithelial cells lining the stomach of vertebrates are protected from damage by $HCl$ because

$A$ $2$-year-old boy is admitted to play school. During a dental check-up,the dentist observes that the boy has $20$ teeth. Which teeth are absent?

Identify the parts of the stomach labeled $P$,$Q$,and $R$ in the given diagram.