They are heterotrophs that get their energy by consuming autotrophs and other heterotrophs. They are photoautotrophs that make food by converting water and carbon dioxide into glucose and oxygen, using energy from the Sun. They are saprotrophs that recycle organic waste into food that can be eaten by consumers. They are chemoautotrophs that use organic chemicals as an energy source to make food when not enough sunlight is available.

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.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion