The law of conservation of energy is a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another.
For example: A bowling ball hitting bowling pins. The energy is transferred and no energy is lost.
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They are released by dead and de caying organisms
Your nerves go into your bone, I know it sounds crazy but its true, your Skeletal system is mixed with your nerves, it helps you function, without your nerves going into your bones we couldn't be able to feel if a bone is hurting or if you are getting hurt without your nerves you couldn't feel pain your nerves help you feel pain and where the pain is coming from.