Which was the first living organism on Earth?

The first living body was amoeba. This consisted of single cell and would procreate by splitting itself. seethe link below:

http://www.enchantedlearning.com/subjects/protists/amoeba.shtml

I thought it was a reptile and i am not sure whether amoeba is a living or not?

archebacteria is the first living organism on Earth.