What enzyme is responsible for carbohydrate digestion in the small intestine?

Pancreatic amylase

The pancreas secret pancreatic juice that has pancreatic Amylase (enzyme) and they breakdown the carbohydrates into polysaccharides

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.