Animation Description
The image that accompanies this question shows an evolutionary tree involving just three descendent species: A, B, and C. An arrow shows that time progresses in the upwards direction on the tree. On the tree, starting from the root, the branch leading to A splits off first to the left, and then the branch leading to B splits off to the left. The branch leading to C is at the right side of the tree. Two branches of the tree are highlighted in red: an upper branch that leads from a branching point to taxon B, and the root of the tree that extends down vertically from the lowest branching point. When the upper red area leading to taxon B is clicked, that area is labeled "unique history of B" and the B taxon is highlighted. When the other red area is clicked, the reader is instructed to "try again."
Animation Text
Panel 1
Click on the part of the diagram that represents the unique history of B.
Panel 2
Incorrect response: Oops! Look carefully at the diagram. Try again.
Panel 3
Correct response: Great! Now that we have reviewed these points, let's move on to Folder 3, where you will learn how features are used to determine ancestry.