If a limiting nutrient is supplied to the producer in the diagram above, what effect could it have on the birds?

The producers are the bluegrass. Adding a limiting nutrient to the grass would increase the amount of primary  productivity. The result would be an increased amount of biomass at the producer level, and increasing  biomass and available energy at each successive level. The number of birds could increase, because there  would be more for them to eat.

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answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

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.