What is the main function of mesophyll tissue of leaves?

a.) conduction of substances
b.) regulation of opening and closing of stomata
c.) photosynthesis

1. a tropical dry forest carries out more rapid nutrient cycling

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.