c language and embedded systems based questions

-difference between structure and union -difference between cisc and risc -difference between micro processor and micro controller -difference between c and embedded c -difference between static and const keywords -what is volatile -a program to print Fibonacci series starting from 0 where if one value is printed next one is not printed,next one is printed and next two are not printed,next one is printed and next three are not printed,and so on until the given limit. -write a structure in a union