The repetition of responsibility in the passage helps obama achieve his purpose by providing evidence to support his speech. Emphasizing the main idea of the speech. Showcasing his expertise at writing a speech. Soothing the audience with the rhythm of the speech

Imagine that a team of scientists test a certain hypothesis, and the experimental results show that it is false. how will this information most likely be in the future? the hypothesis and experiment will not be discussed again. the hypothesis will be used to support a different theory. the results will be on record and can inspire a new hypothesis. the results will show which other hypotheses must be true.