Name the four hormones secreted by the duodenal epithelium as the food enters the duodenum

Cholecystokinin – It is responsible for contraction and relaxation of gall bladder to release bile into the stomach in order to digest the fat and protein present in the food.  

Duocrinin – It is responsible for stimulation of Burner’s gland to secrete enzymes and mucus to help indigestion.

Enterogastrone – It is involved in inhibition of gastric secretion when the condition is unfavorable.

Secretin- When the acidic content of the empty stomach reaches the duodenum, this hormone is secreted.

Explanation:

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sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.