Why do elements of the same group have the same chemical properties? Group of answer choices

they are all the same size

they have the same number of energy levels

they have the same number of valence electrons

they have the same number of protons

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