After reading this book I have gained a lot of knowledge about the beauty of evolution. In Chapter One the book talks about the six components of evolutionary theory. There are six key steps. The first step is evolution which is when a species undergoes genetic change overtime. That is over time a species can evolve into something different, and those differences are based on changes in the DNA (pg.3). The second step, gradualism means it takes many generations to produce a substantial evolutionary change, such as the evolution of birds and reptiles(pg.4). The third step, speciation means the evolution of different groups that can’t interbreed. Meaning these groups can’t exchange genes(pg.6). The fourth step, common ancestry is the flip side of speciation. It means that we can …show more content…
That would not have such imperfections, but imperfect design is the mark of evolution, in fact, it’s what we expect of evolution (pg.81). In Chapter 4 Geography of Life this was about evolution of plants and animals on in a geographical standpoint. The biogeographic evidence for evolution is now so powerful that I have never seen a creationists book, article, or lecture that has tried to refute it. Creationists just pretend the evidence doesn’t exist, (pg.88). Convergent evolution, is when species that live in similar habitats experience similar selection pressures from their environment, so they may evolve similar adaptions, or converge, coming to look and behave very much alike even though they are unrelated (pg.94). A great example of convergence is cacti and euphorbs. The ancestors of euphorbs colonized in the Old World, and that of the cacti in the Americas. Both species winded up in the desert evolved similar adaptions: if you’re a plant in a dry climate, your better off being tough and leafless with a fat stem to store water. So, natural selection molded euphorbs and cacti into similar forms