Shubin discusses the olfactory sense of a living organism and how the DNA is triggered when being put to use. He also mentions how that olfactory genes are always copied but they're different every time. To convey his point, he uses alot of similies and metaphors to how these genes work. It made sense to me that the genes used to detect different scents would be the same but different at the same time. The similarity would be how they work but the difference between each gene is what kind of scents they pick up. This was another point I thought I would not understand but understood as I thought more about it.
In this chapter, I also notice that Shubin goes back to Tiktaalik and how it's sense of smell is different because it has an external and internal nostril just like us today. This supports Shubin's point that humans have evolved more from early ancestors of the fish. This was another step for me in believing the interesting aspects of evolution.
-Briana Fauni
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