define a) lever,b) pulley,c) machine.
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The liver is an organ only found in vertebrates which detoxifies various metabolites, synthesizes proteins and produces biochemicals necessary for digestion and growth. In humans, it is located in the right upper quadrant of the abdomen, below the diaphragm.
a piece of equipment, consisting of a wheel and a rope, that is used for lifting heavy things
a piece of equipment with moving parts that is designed to do a particular job. A machine usually needs electricity, gas, steam, etc.
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