Unknown Story
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- Fossils are traces of organisms that lived in the past and were preserved by natural process in sediments.
- They can be remains of organisms such as bones, shells, teeth and feces
- Mhm!
- Fossils may be classified as impression or imprints and compression. Impression are shallow external molds left by animal or plant tissues with little or no organic. 
- Compression is the other side with more organic material.
- The next evidence is Comparative Anatomy. It provides evidence of evolution by comparing anatomical structures of different species. 
- Do you know an example of this evidence?
- Right again!
- Like the similarity of bone structures in whales and humans?
- There are two major concepts of comparative anatomy. The Homologous and Analogous.  Structures from different species which have similar internal framework, position and embryonic development are considered to be homologous - just like the example you gave.
- The presence of homologous structure is also a strong indicator that the organisms evolved from a common ancestors. However, these features or structures completely serve different functions.
- Analogous structures, on the other hand, are structures of unrelated species that may evolve to look alike because the structure is adapted to similar function.  For example, a bird and a butterfly can both fly, but they do not have similar structures.
- Both have the same functions but different in origin.
- Oh! I'm getting it now.
- Another evidence  is from Embryonic Development.  Any ideas about this?
- Correct!
- Oh! Oh! Some homologous structures of different species can be seen only in embryo development.
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