Answer:
A- A demonstration shows how something works, often including models
Explanation:
A demonstration allows, through experimentation, to show how nature works and in that way can include the explanation of scientific theories that explain the set of observed facts, that is, it serves as a demonstration of the underlying scientific principles.
Id say d because it releases hydrogen and on the other hand a base receives it
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pitch is the perceived frequency of a sound wave.
Answer:
a. when the acceleration of the objects become negative
