Isn't the nucleus the largest one? Why is there only one option with nucleus first and it's not in the right order?

Which of the following is not a defining characteristic of plants?

Me with these questions image attached

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing