they start running out of food can’t feed the chiefs and boom the chief’s priests etc can’t keep the complex society running and everything went to turmoil. Rival clans were created people fighting killing each other breaking heads off statues by 1864 the last stone head had been destroyed.Diamond brings this all together as a means of showing people that Easter Island can be a small scale earth. He says if we continue our course we are going to exhaust fisheries, fossil fuels, soil, and rain forests. He finishes with saying that we need to learn from these civilizations that ruined their environments and went extinct, and that he wishes his son's generation will learn from the facts and correct the dangerous course that we are going down. “Darwin’s Birthday Suite” – Jablonski (PDF4)
Darwin believed that skin color was due to sexual selection. Anthropologist proved Darwin’s theory wrong stating that the closer the equator you live the darker your skin color is. This is just to shield from UV rays. At first, they thought that the skin color was like a sunscreen protecting you from sunburn, skin cancer, and overproduction of vitamin D. This was not true. Instead what was actually the reason for the dark skin is to stop the breakdown of the B vitamin, folate. The folate deficiencies would lead to birth defects. Folate is important for rapidly developing cells like an embryo. So, natural selection favored darker pigmented skinned people and they had success reproducing and then the dark pigment trait was carried over. We can bring this dark pigmented skin back to more than 1 million years ago, in the homo genus. When the species started moving up into the Eu area they adapted to the regional change. Started wearing clothes to keep warm this also protected the skin from UV rays the mixture of spending time in the shade and wearing clothes forced the body to change the skin pigment. Vitamin D is very important it prevents rickets and autoimmune disease which impacted reproduction fertility. Once again natural selection lighter skinned pigment trait will be passed on for people that live-in regions that wear clothes. Humans now travel far and wide and we spend time in doors, we are also aware of the benefits of vitamin D and the harm the sun can have on our skin if we get too much exposure. Jablonski starts concluding about how race is not determined by your skin color, and that Darwin might have been wrong but he did bring light to natural selection and in the end this is natural selection and Darwin had inspired thousands of people to investigate its workings.