How can resource availability affect interactions between organisms?
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Alterations in resource availability can increase or decrease the intensity of interactions between organisms. This may also cause evolutionary changes to life history traits.

Explanation:

the dark variety, as they are not visible on the dark tree barks

explanation:

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.