Answer: Light
Explanation: Light can travel in empty space or vacuum. It doesn't need any medium to which it travels.
This statement is true. Plaque is considered dangerous because it can break off and create a clot in the arteries. one of the most common results of this is heart attack.
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The correct option would be B. consent can be obtained from adult stem cell donors.
The controversy behind the other option is that it is a form of life, but no consent is taken from the actual life. (i know it's phrased weirdly, my bad)
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