Explain the importance of fossils in deciding evolutionary relationships.

Fossils are preserved remains of living organisms from the remote past. Fossil mainly preserves only a portion of the dead organism (e.g., skeleton, bone, teeth etc..).

Fossil provides us evidence about

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

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