How does natural selection explain the
differences in finches on the outside if they all
came from the same finch in the center?

So natural selection is when humans or animals adapt to where they live so they can survive or live better so when the finches on the outside go to different environments they would have to adapt to that place even if they came from the same finch

He should use column or clustered column chart.

Explanation:

On the MS word or MS excel there many types of charts which can be produced according to the type of information which is used to plot and the purpose of plotting.

For example if you want to plot the values of an or different events on the chart you just draw line chart.

But for charts which are used to compare and contrast the information, then column or scattered column charts are used.