It was about 500,000,000 years ago when organic evolution began. Plants and animals were spread out into the seas and across the land. The way from fish to amphibians, from amphibians to reptiles, from reptiles to mammals there was a regular progression of the encephalon up to the appearance of the power to reflect and thinking: from the Homo Habilis to Homo Erectus up to the Homo Sapiens Sapiens.
