Module 12 Lesson 1
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The document discusses several theories related to the origins and evolution of life: 1) The theory of spontaneous generation, which was disproven by experiments showing that living things come from other living things, not nonliving matter. 2) Oparin's primordial soup theory that early Earth conditions allowed organic compounds to form from chemical elements and sunlight, providing building blocks for early life. 3) The distinction between microevolution, involving small changes within a population over time, and macroevolution, referring to large changes that resulted in new taxonomic groups like bacteria evolving into humans.
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Module 12 Lesson 1
- 2. Theory Of Spontaneous Generation or Abiogenesis This is an incorrect theory that was believed for many centuries. It stated that living things come from nonliving things. Aristotle said that it explained how life got here. A variety of experiments were performed to disprove it. Redi proved that maggots come from flies, not meat. http://www.slic2.wsu.edu:82/hurlbert/micro101/images/maggots.gif
- 3. Biogenesis After many years it was concluded that life comes from life. Pasteur’s experiment helped to disprove spontaneous generation. facstaff.gpc.edu/.../Microbial%20World.htm
- 4. Oparin’s Organic ( Primordial)Soup Theory He believed that Earth’s early atmosphere had the chemical elements necessary to create organic compounds. These elements combined due to static electricity and sunlight and made the first organic compounds. He hypothesized that these organic compounds were the building blocks of the first life forms. His theory was tested out by Stanley Miller in a lab where he was capable of creating amino acids.
- 5. Microevoultion Small Changes in a population over time. http://blog.nature.org/wp-content/uploads/2009/02/darwins_finches_by_gould.jpg
- 6. Macroevolution Large changes over time. Bacteria Man The first organisms were probably Prokaryotic ( without a nucleus) Unicellular ( one celled) Anaerobic( They don’t need oxygen) And they probably lived in the ocean.