Answer:
IV: Where the workers work, public and at home
DV: Number of workers infected by Coronavirus
Answer:
amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. For a longitudinal wave, such as a sound wave, amplitude is measured by the maximum displacement of a particle from its position of equilibrium
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i think 4th because in photosynthesis plants produces and release oxygen into the air.