What is Evolution? 生命的40亿年历程-First life starts about4 billion yrs ago 2 Ma: First Hominids 230-65Ma: 4550Ma: Dinosaurs Formation of the Earth dominid出 Mermels ca.380 Ma: Lad口as First vertebrate land animals Mufucellufer lise 4527Ma: ELka可os ca.530 Ma: Formaton of the Moon Cambrian explosion 46Ga ca.4000 Ma:End of the 750-635Ma: 1极a Late Heavy Bombard加ment Two Snowba■Earths frstlie 542 BA 传en 4G ca.3500 Ma: Photosynthesis starts 1G5 Protrozoie Archean 光合作用 产生了氧气 265 ca.2300Ma: 2016/10/27 Atmosphere becomes oxygen-nch; 18 frst Snowba■Earh2016/10/27 1 18 What is Evolution? 生命的40亿年历程 –First life starts about 4 billion yrs ago 光合作用 产生了氧气