$.$ If c $=1$ is doubled to c $=2,$ what is the effect on the amplitude and period of both x$($t$)$ and y$($t$)?$ What does c represent in the Lotka$-$Volterra Models? Does the effect on the solutions curves make sense? $6.$ If c $=$ is halved to c $=0\mathrm{.}5,$ what is the effect on the amplitude and period of both x$($t$)$ and y$($t$)?$ Does the effect on the solutions curves make sense? $7.$ If d $=0\mathrm{.}9$ is doubled to d $=1\mathrm{.}8,$ what is the effect on the amplitude and period of both x$($t$)$ and y$($t$)?$ What does d represent in the Lotka$-$Volterra Models? Does the effect on the solutions curves make sense? $8.$ If d $=0\mathrm{.}9$ is halved to d $=0\mathrm{.}45,$ what is the effect on the amplitude and period of both x$($t$)$ and y$($t$)?$ Does the effect on the solutions curves make sense?