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if you need to plot different figure on the same page use the following syntax.
my_mean<-30
par(mfrow=c(1,2))
plot(function(x) dnorm(x, my_ean, 15), -20, 80, ylab="Density", xlab="Size", col="dark green", lwd=2)
plot(function(x) dlnorm(x, log(my_mean), 1.5), 0, 80, ylab="Density", xlab="Size", col="blue", lwd=2)
mfrow will create one row with two columns.
each time you call plot R will use one of the available columns. So, in the previous example, R will plot a normal in the first column and a lognormal distribution in the second column.