When you buy bulk, the price per individual items
a. increases
b. decreases
c. stays the same

B. Decreases

According to the golden rules of business when the supply increases with the demand, the prices are reduced by the suppliers because manufacturing cost of a single product is very costly as compared to the manufacturing cost of a bulk of products. The same rule is applied to the purchaser if he purchases bulk of products, the cost will decrease.

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.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.