Is archaea the first organism that came on Earth?

The oldest fossils resemble cyanobacteria, vaguely. Todays cyanobacteria are prokaryotes, not archaea. These fossils are 3 BYA. The oxygen content of the atmosphere starts to go up at that time, consistent with the presence of cyanobacteria. read more

It is believed that the first organisms to appear on Earth resembled singled-celled life forms known as Archaea, which are similar to bacteria but lack nuclei. Modern-day Archaea can live in extreme environments such as hot springs and deep-sea vents. read more

The first organism on the Earth was a Single- Cell Bacteria evolved in water . The age of earth is a about 4.5 Billion Years. read more

according to many and according to my studies LUCA was the first organism(living) to have set foot on earth although it didnt have any feet LUCA IS LAST UNIVERSAL COMMON ANCESTOR yeah LUCA is the most recent common ancestor of all current life on EARTH.LUCA should not be assumed to be the FIRST LIVING ORGANISM ON EARTH. read more