The answer would be 'First rocks formed on Earth'.
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.
Answer:
Matter
Pure substances Mixture
Element compound Homogenous Heterogenous
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the answer is
C. a tennis racket striking a tennis ball
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