Relative to the percent of time dominating the surface of the Earth, which organisms have been here the longest? 1. eukaryotes
2. prokaryotes (single celled organisms)
3.plants
4.dinosaurs

Prokaryotes (single celled organisms)

Explanation:

Prokaryotes are single celled organisms or unicellular that lack membrane bound organelles such as the nucleus. Instead their DNA us found in a coiled loop floating freely in the cytoplasm in a region called the nucleoid. Examples that include prokaryotes are Bacteria and Archaea.

They have been estimated to exist on Earth about 3.5 billon years ago where life first started.

sorry, but you do not have posted the diagram.