Explain the importance of fossils in deciding evolutionary relationships.

Explanation

Fossils provide us evidence about,
a. The organisms that lived long ago such as the time period during which they lived, their structure etc.
b. Evolutionary development of species i.e line of their development
c. Connecting links between two groups. For example, feathers present in some dinosaurs means that birds are very closely related to reptiles.
d. Which organisms evolved earlier and which came later.
e. Development of complex body designs from some simple body designs.