What are the possible causes of digestive system disorders like diarrhea and constipation? .
a- a disorder in excretion of water by the large intestine.
b-a disorder in absorption of water by the large intestine.
c-a disorder in release of digestive enzymes by the large intestine

Answer - B
Almost all the nutrients are absorbed in the small intestine and only water and roughage reaches the large intestine via peristaltic movements. Before the waste material is excreted out, a large quantity of water is reabsorbed. Therefore, a defect in the re-absorption of water by the large intestine will cause one of these two disorders.

The zone your looking for is the intertidal zone.