Which organism has the least energy grass--> rabbit--->raccoon---> wolf

The Wolf

Explanation:

Food chain follows a law called 10% Law.

It follows that the carnivores (secondary consumers) that feed on herbivores and detritivores and those that eat other carnivores (tertiary consumers) have the lowest amount of energy available to them.

Hence wolf has the least energy

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion