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Use the following to answer question :
-feudalism
Energy
The capacity to do work; expressed in kilojoules or kilocalories.
Irreplaceable
Something that cannot be replaced or substituted because of its unique qualities or significance.
Free Energy Change
A measure in thermodynamics indicating the amount of energy in a system that is available for work during a chemical reaction.
Endergonic Reactions
Chemical reactions that absorb energy from their surroundings, typically requiring an input of energy to proceed.
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