BIO1110.05 - Week 5 Notes Photosynthesis: o The source of oxygen (O 2 ) in the atmosphere. o Converts carbon dioxide(CO 2 ) to oxygen. o Source of Ozone (O 3 ) Protects the earth and living organisms on earth from harmful ultraviolet (UV) rays Fossil Records: o Allow the present society to learn and understand the life that no longer exists and the different environments that the Earth used to have. o Allows us to learn about the past and life before humans. o Challenges: Many organisms will not fossilize because they lack the required hard parts that can survive for so long under such hard conditions. Evidence is also very hard to put together and compile. Cyanobacteria: o A “blue-green algae” o Has about 3000 discovered species currently o Majority usually exist as colonies o Cyanobacterial products are central to human society: Oxygen Nitrogen (ammonium)
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- Spring '08