Age of the Earth By Alyssa_Abigail Jan 1, 2015 Formation of Earth 4.6 billion years ago http://www.solstation.com/ Mar 3, 2015 First single-celled organisms 3,500 million years ago imgbuddy.com Nov 11, 2015 First multicellular organisms 650 million years ago http://imgalbums.com/ Nov 16, 2015 Cambrian explosion 542 million years ago https://geologicaltime.wikispaces.com Dec 10, 2015 First Dinosaurs evolve 231 million years ago Dec 24, 2015 Extiction of Dinosaurs 66 million years ago http://www.earthmagazine.org/ Dec 31, 2015 First Humans Evolve 400,000-200,000 years ago http://www.dailymail.co.uk/
