Simplify the expression 
.
Definitions:
Direct Observation
A research method involving the direct and unobtrusive observation of individuals or phenomena in their natural setting.
Chemical Make-up
Refers to the composition of a substance, detailing its various chemical elements and compounds.
Produces Heat
A process or object that generates thermal energy.
Direct Observation
A method of gathering data by watching behavior or phenomenon in its natural setting without manipulation or control by the observer.
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