One glucose molecule provides enough carbon for two trips through the citric acid cycle. how many molecules of atp are directly produced in two trips through the citric acid cycle?

38 molecules of ATP

Explanation:

Glycolysis is the cellular degradation of the simple sugar glucose to yield pyruvate, and ATP as an ENERGY source.

The pyruvate ENTERS the Citric acid cycle yielding ATP and some REDUCING EQUIVALENTS like FADH and NADH.

These reducing equivalents enters the ELECTRON TRANSPORT SYSTEM to yield molecules of ATP.

So, the number of moles of ATP generated from two trips is 38 molecules.

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.