Rat growth is indicated by gain in weight. Antibiotics increase growth rate. Exercise increases muscle mass. Image source: http://www.becomingdomestic.co.uk/wpcontent/uploads/2008/05/rat2.jpg
ExerciseAntibiotic NoneXY Multivitamins absent Multivitamins present Multivitamins absent Multivitamins present Multivitamins absent Multivitamins present Absent 0.3090.3070.5160.5450.3710.474 Present 0.8934.3451.4854.4552.5995.459 Table 1: Fresh weight (g) of rats after three months’ growth with and without multivitamins, with and without antibiotics and with and without exercise
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