permission letter for school reopen in covid 19
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The velocity of an object is the rate of change of its position with respect to a frame of reference,and is a function of time. Velocity is a physical vector quantity; both magnitude and direction are needed to define it..
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Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities.
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