1001 Space Earth Nature Evolution Fossils and Prehistoric Life Dinosaurs Simple Animals Insects and Spiders Fish Amphibians Reptiles Birds Sea Mammals Land Mammals Plant Kingdom How Plants Live Unusual Plants Ecology Conservation Animal Behaviour Pets and Farm Animals History Human World Science and Technology

Choose a Page:What is evolution?Can an animal evolve an extra limb?Has mankind changed the course of ...Does evolution always work?Do plants evolve?*When did evolution start?*When did flowers evolve?Why do birds have beaks?Who discovered evolution?Can the same creature evolve twice?Why are cave fish blind?When does extinction occur?Is evolution dangerous? When did evolution start? Evolution began, over 4,000 million years ago, with the origin of molecules that could make copies of themselves. These gave rise to the first simple cells, which gave rise to the first animals. An illustration of evolution   Previous: Back Book: 1001 Section: Nature Chapter: Evolution