Mutation would be one of them.
Mitosis is the process by which genetic material is distributed and condensed into two new nuclei. Without this, cells would not be able to reproduce.
When the rocks are removed from a desert's ecosystem, the animals that depend on those rocks for homes would be in trouble. If these animals died due to predators and a lack of homes, then the other animals (predators) that depend on them for food would start to need other sources of food. This would cut into another predator's food supply and so on.
