Observe the given part of the digestive system. What is it ? What is its role

Observe the given part of the digestive system. What is it ? What is its role during digestion ?
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A. 1) It is large intestine present in human digestive system.
2) In large intestine, water and mineral salts are absorbed.
3) Faecal matter containing undigested food material, bile pigments and dead bacteria is formed in the large intestine.
4) It is stored into the rectum of large intestine.