History of life on Earth

• Evolution of RNA and DNA

  One hypothesis suggests that RNA evolved before DNA
• Where did life evolve?

  • Cold volcanic vents were the best environment for organic reaction to occur during early Earth.
• Endosymbiosis


  • Process of life begins from prokaryotes to eukaryotes.
  • Serial Endosymbiotic Theory - Chloroplast and Mitochondria evolved from symbiotic bacteria that lived inside a larger prokaryote.
  • Sexual Reproduction - arose soon after eukaryotic