Answer:
The letter D is the right answer.
Step-by-step explanation:
Fossils are an important tool for geologists and biologists. Through the study of fossils, geologists are able to identify the paleoenvironment that generates sedimentary rocks as well as their relative age, the movement of continents, the variation of the Earth's climate, and so on.
Biologists, who seek to understand how the great diversity of organisms arose, use fossils in their evolutionary studies. Understanding the processes that have controlled the evolution and dispersal of organisms throughout the Earth is helpful in understanding such issues as the emergence of life, the emergence of new species, biological crises, and so on.
Fossils are very important for humanity to find out which beings lived in prehistory, without fossils we would never know what our ancestors looked like, when they first appeared, how long they lived, and how they lived. Without fossils no theory of our origin could be proved or discarded! Fossils are the most concrete proof of our existence, the existence of dinosaurs among others.
The study of fossils allows us to know the living beings of the past, the environments in which they lived and their evolution. It also allows us to date the rocks they are in. In short, it contributes to the reconstruction of Earth's history.