Chapter 5

Honestly, I had no idea what chapter 5 was about. At least, not until after the first 2 pages of the chapter. What I found interesting was the fact that every figure and organ of our body is made from arches. Whats more fascinating is the fact that every different species' embryos develop in the same way that humans do. This also relates back to the previous chapter. The previous chapter mentioned the Sonice Hedgehog. The arches make the gills in sharks and fish while our arches work to close up the gills that we have as embryos. Does this not show the Sonic Hedgehog in action? The Sonic Hedgehog is in action by formulating how much development or underdevelopment the arches are meant to take; therefore, creating the different figures of species that we see today. If the Sonic Hedgehog's functionality is altered arches, newborns with disfunctional gills are born, just as Shubin mentions. This is just a theory; it may be false.