EEB211_Lecture7_Origin_Of_Life notes

EEB211_Lecture7_Origin_Of_Life notes - Lecture 7 Origin of...

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Life today consists of noncyclic photosynthesis and aerobic respiration. At first, there was no Oxygen and there was no photosynthesis of any type. How did we move from there to where we are today? (1 st theory) Natural selection acts automatically without external/supernatural forces. (2 nd theory) A possible theory regarding the presence of life or gases that support life on earth is asteroid/ rock launching off of Mars and hitting earth “infecting” it with bacteria/foreign substances. Nano bacteria are they alive (their genomes would be extremely limited by size). There is various evidence present that suggests bacteria traveled to earth on meteorites (see pictures) (3 rd theory) Heat and pressure of stars synthesizes/fuses the various elements from hydrogen, and these elements are sent about the galaxy (for instance towards earth) resulting in foreign elements on earth. (Abiotic evolution). Meteorites may carry things along with them as they hit earth. Comets were believed to carry some of earth’s water, because of their composition – they may have also carried/brought various other elements. Formaldehyde if 6 of them are put together, they create sugar this would provide a good means of storing energy.
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