a thing, especially a trend or fact, that indicates the state or level of something.
 
        
             
        
        
        
Answer:
C. making models
Explanation:
Making models facilitates constructing depictions of complex objects or practices that enable students to practice and understand how things work which can not be observed and measured directly. Model making needs abstract thinking about the tools and material used, spatial thinking, and well-organized idea of the project to create complex objects.
 
        
             
        
        
        
<span>Wood
Plastic
Porcelain
Rubber
Ceramic<span>
Asphalt
Those are just some of them
https://www.reference.com/science/materials-good-insulators-b06a490d0e37f88b
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It basically works like this:
You dry out the food 
put it in this ceramic oven thingy surrounded with water 
burn the food 
the water will heat up
measure the water temperature in f
= calories
Calorimetry is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due, for example, to chemical reactions, physical changes, or phase transitions under specified constraints. 
in this case, you're finding the amount of energy is contained within it when combusted