Question

people who study plants, animals and other organisms that existed in prehistoric times ... image of scientists with plant samples options: (partially visible) chaeologists, paleontologists, chemist, geneticists

Explanation:

Paleontologists study prehistoric plants, animals, and organisms by examining fossils. Archaeologists focus on human history/culture via artifacts, chemists on chemicals, and geneticists on genes/DNA. The description matches paleontologists.

Answer:

Paleontologists