Solutions to some problems are intrinsically recursive, and writing them in the iterative fashion is difficult. Reverse also holds. Discover the example or recursive procedure and represent it as iterative procedure. Also, select the iterative procedure which you would re-write as recursive. Make sure to cite your sources. Also, you require to understand the algoithms you select so you can describe and assess them. Write challenges did you face in process? How did you go about resolving them?