Wednesday, November 12, 2014

Evidence of Evolution- Hannah Alden

Evidence of Evolution:
1.     Studying Fossils: many organisms have changed over time; in rocks more than one billion years old, only fossils of single-celled organisms are found. Most fossils are found in sedimentary rock. A fossil record provides evidence that living things have evolved.
2.     DNA:  by comparing DNA sequences of genes from one organism to another, we can learn an enormous amount about their relationships. DNA defines who we are, but our DNA, which encodes us, was actually able to determine its own sequence, using people as a tool for the process.













3.    Homologous Structures: they are similar in function; they indicate that two r more species share common ancestors. They are made up of the same kind of bones; body parts that are similar in origin and structure are called homologous.


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