What are fossils? What do they tell us about the process of evolution?

(N/A) Fossils are the preserved remains or impressions of organisms that lived in the distant past.
They provide direct evidence of evolution by showing the structural characteristics of ancient organisms.
By studying fossils,scientists can determine the evolutionary history of species and observe the gradual changes that have occurred over millions of years.
They help in establishing the link between extinct organisms and their modern-day descendants,thereby demonstrating the process of descent with modification.