A paleontologist is a scientist who studies fossils. These experts analyze the remains of ancient organisms, including plants and animals, to understand various aspects of their biology, evolution, and the environments that existed in the past. By examining fossilized specimens along with geological strata, paleontologists can reconstruct ancient ecosystems and contribute to our understanding of Earth's history. Their work plays a critical role in discovering how life evolved over millions of years and the factors that led to extinction events.