Ascientist wants to use a model to present the results of his detailed scientific investigation.
why would a model be useful?
o because the model makes the concepts easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it

The correct answer is A. Because the model makes the concepts easier to understand

Explanation:

A model refers to a three-dimensional representation of an object or idea. This means in the case of a model to represent the results of a scientific investigation, this is a way to represent visually what scientists found during a research process. In this context, using models has some benefits because due to models being visual these are easier to understand than texts, especially if people are not experts in the topic or the results include complex concepts as models represent visually complex ideas. Thus, a model would be useful "because the model makes the concepts easier to understand".

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask