On the research team of the eminent virologist Dr. Thomas Francis, who was working on a flu vaccine, was a young physician<span> named Jonas Salk.</span><span>
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Answer:
The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.
