Lucy was found by Donald Johanson and Tom Gray on November 24, 1974, at the site of Hadar in Ethiopia. They had taken a Land Rover out that day to map in another locality. After a long, hot morning of mapping and surveying for fossils, they decided to head back to the vehicle.
Alkanes are an example of saturated compounds. An unsaturated compound is a chemical compound that contains carbon-carbon double bonds or triple bonds, such as those found in alkenes or alkynes, respectively. Saturated and unsaturated compounds need not consist only of a carbon atom chain.
The unsaturated organic compounds contains double bonds while the compounds contain no any multiple bonds are known as saturated compounds. The unsaturated molecules have both the sigma and pi-bond. Thus the unsaturation is due to the presence of pi-bond. The unsaturation is usually in olefins (double bond), acetylenes (triple bond), and also in cyclic molecules. The unsaturated compounds are able to react with hydrogen in the presence of catalysts.