Select the correct answer.
Which words best complete this sentence?

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What is chemistry and it applications

What point is the author trying to make by comparing the travel times of the first transcontinental railroad and the first transcontinental flight?

Which is the most effective paraphrase of the passage "six benches were left empty in every ship that evening when we pulled away from death. and this new grief we bore with us to sea: our precious lives we had, but not our friends" - the odyssey