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.

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.