In the equation $\mathrm{W}_{1}=\mathrm{W}_{0} \mathrm{e}^{\mathrm{rt}}$, $\mathrm{W}_{1}$ is the final size, which could be the weight, height, or number or any other parameters. $\mathrm{W}_{0}$ is the initial size at the beginning of the period. $\mathrm{r}$ is
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