Describe one example of vestigial structures that you can find among the caminalcules. these are structures that have been reduced to the point that they are virtually useless. ear muscles and the tailbones are examples of vestigial structures in our own species.

weathering is the answer.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.