Three illustrations shown are:

1. Cladograms are diagrams showing how evolutionary lines, or lineages, split from each other over time. This diagram shows a single ancestral lineage splitting into two. The point of splitting is called a “node” in the cladogram. The ancestral lineage is shown as a blue pink U shaped curve and at the node two labels read 'Splitting event' and 'Ancestral lineage'.
2. The next illustration shows four separate lines labeled as 1, 2, 3, and 4 and called 'Descendants' merging into one line. The text accompanying the illustration read 'How recently lineages share a common ancestor reflect how closely the lineages are related to one another. Here, lineages 3 and 4 are each more closely related to each other than any of them is to any other lineage.'
3. This cladogram shows the evolutionary relationships among vertebrates, animals with backbones. The species that are represented by pink lines merging into the pink line for 'Mammals' are labelled 'Sharks', 'Ray-finned fishes', 'Amphibians', and 'Turtles'. The lines for 'Snakes' merges into the line for 'Lizards' which further merges into the line for 'Birds' The line for 'Birds' merges into the line for 'Turtles' which meres into the line for 'Mammals'. The line 'Crocodiles' merge into the line for 'Birds' which merges into the line for 'Lizards' and subsequently 'Turtles'. This line then merges into the line for 'Mammals'.