BISC 1112 Chapter Notes - Chapter 25: Radiometric Dating, Cambrian Explosion, Supercontinent
Document Summary
Chapter 25 (522-524, 526-532)- the history of life on earth. Macro evolution- broad pattern of evolution above the species level: ex- emergence of terrestrial vertebrates through series of speciation events, the impact of mass extinction on biodiversity, and the origin of key adaptations such as flight. Protocells- droplets with membranes that maintain internal chemistry different from that of their surrounding: 4) the origin of self-replicating molecules that eventually made inheritance possible. Synthesis of organic compounds on early earth: for earth"s first 100 years, it was bombarded with of rock that generated heat, causing all of the available water to vaporize. The vaporization prevented the formation of seas and lakes: once the bombardment ended 4 billion years ago, the earth was left with little oxygen and an abundance of carbon dioxide, methane, etc. The energy for this could have come from lighting and radiation. Haldane sad that early oceans were a solution of organic molecules, a.
