Which organisms appeared on earth first

The organisms which appeared on earth first was bacteria.

Explanation:

Bacteria.

Explanation:

The first living beings on the Earth, were the single-celled organisms called as micro-organisms or the microbes that lacks a cell membrane or cell nucleus known as Prokaryotes, seems to be appeared first on the Earth almost 4 billion years ago, which was just a few 100 million years subsequent to the Earth formation itself. Considerably, the longest part of the life history on the Earth, thus, involved the biochemical development of these unicellular micro-organisms, such as bacteria and archaea.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.