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Compare and contrast bio-mass and hydroelectricity as sources of energy.
Bio-mass:
It is obtained from . It is a .
Examples - and .
Hydroelectricity:
It is obtained from the .
and are used in hydroelectricity.
Answer variants:
gobar gas
potential energy of the stored water at a particular height
reservoirs
dead plants and animals
wood
renewable source of energy
Dams
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