The particles in a sand dune deposit are small and very well-sorted and have surface pits that give them a frosted appearance. this deposit most likely was transported byocean currentsglacial icegravitywind

For the answer to the question above, the answer is "wind."

The wind carries these particles in a sand dune deposit. This is small and sorted. The pits on the surface are the one which gives them the frosted appearance. The transportation of this things are possible because the wind carries them

Because the carnivores keep the herbivore population in check 

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