GE CLST M1B Lecture Notes - Lecture 13: Kalahari Desert, Upper Paleolithic, San People
21 Aug 2017
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Food & fuels: understanding the connections d"auria. Fuel: a substance that produces useful energy when it undergoes a chemical or nuclear reaction. Fuel such as coal, wood, oil, or gas provides energy when they are burned. Compounds in the body such as glucose are broken down into simpler compounds to provide energy for metabolic processes. 4. 5 bya (billion years ago): formation of the solar system and earth. 2. 5 mya (million years ago): first members of genus homo. 1. 8-1. 3 mya homo erectus migrations out of africa: from 1. 9 million to. 200,000 years ago, our ancestors tripled their brain size. 300,000 ya (years ago): solid evidence of hearths. 75,000/70,000 ya: migrations of homo sapiens from africa gradually replaced other humans. 18,000 ya: end of last major glaciation. 50,000 ya-11,600 ya: people were moving down the food chain. Homo sapiens subsisted on a hunger-gather lifestyle for most of its tenure.
