Evolution Class 12 Notes PDF Download | NEET 2027 Biology Chapter 6 NCERT
*EVOLUTION CHAPTER 6 - FULL SHORT NOTES* 📚 *NEW NCERT* *NEET 2027 ### *6.1 ORIGIN OF LIFE* 1. *Big Bang*: Universe 20 billion years ago 2. *Early Earth*: No atmosphere → Water vapor, CH₄, CO₂, NH₃ 3. *Miller-Urey Exp 1953*: CH₄ + NH₃ + H₂ + H₂O + Electric spark → *Amino acids* bane = *Chemical evolution ka first proof* ### *6.2 EVOLUTION OF LIFE FORMS - THEORY* 1.*Darwin. *Branching descent + Natural Selection* = _On the Origin of Species_ 1859 2. *Natural Selection* = Overproduction + Struggle for existence → *Survival of the fittest* - Herbert Spencer ka term ### *6.3 EVIDENCES FOR EVOLUTION* **Evidence** **Example** **Type** **Homologous organs** Human hand, Whale flipper, Bat wing **Divergent evolution** **Analogous organs** Bird wing vs Insect wing **Convergent evolution** **Fossils** **Archaeopteryx** = Reptile + Bird Missing link ### *6.4 ADAPTIVE RADIATION* = Ek ancestor → Alag-alag area → Nayi species 1. *Darwin Finches*: Seed eater, Insect ...