As the protons move down their concentration gradient in the electron transport chain, what's happening with the electrons in the chain?

The protons move from matrix into the inter-membrane space, at this spot the electrons are actually moving down from area of high energy to the area of low energy, thereby releasing energy in its impact. And this energy is used to pump those protons. As protons move towards the inter-membrane space, thus there will be more positive charge due to accumulation of protons.

The gradient formed can also be used to make up ATP. As the protons move down the gradient and then into the matrix, there they come up with an enzyme called ATP synthase, this ATP synthase is use its energy to make ATP. The number of ATP produced is directly proportional to the number of protons that are pumped.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

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.