White blood cells, nerve cells, bone cells, and *striated* muscle cells
they help us see because the retina also contains the nerves that tell the brian what the photoreceptors are seeing
Because it causes them to move, and so they weather that way. Buut the acid rain can leak into the rock and slowly break down the atoms, causing it to chemically weather faster. Also, just regular water/rain can wash away some covering sediment.
It's know as chemical equilibrium
