Think of it like a family tree:
* You and your cousin share a common ancestor, your grandparents.
* Your grandparents gave rise to your parents, who in turn gave rise to you and your cousin.
* Even though you and your cousin look and act differently, you share a common genetic heritage.
The same applies to species:
* Two species sharing a common ancestor have inherited some of their genes from that ancestor.
* Over time, they accumulated mutations and underwent adaptations, leading to the differences we see between them today.
* The more closely related two species are, the more recently they shared a common ancestor.
Evidence for Common Ancestry:
* Fossil records: Fossils show a gradual transition between extinct and modern species.
* Comparative anatomy: Similarities in bone structures and other anatomical features suggest common ancestry.
* DNA analysis: Genetic similarities between species reveal their evolutionary relationships.
* Biogeography: The distribution of species across the globe is consistent with their common ancestry.
Common Ancestry is Fundamental to Evolution:
The concept of common ancestry is a cornerstone of evolutionary theory. It explains the diversity of life on Earth and provides a framework for understanding how species have evolved and continue to evolve over time.
