The phylogenetic tree below depicts the evolutionary relationships of the following species A through M.

Four horizontal dotted lines, labeled from top to bottom as Present time, 10 million years ago, 20 million years ago, and 30 million years ago. A point labeled A is located on the line labeled 30 million years ago. A vertical line extends from point A to connect to point B, which is located on the line labeled 20 million years ago. Line segments branch off from point B to the left and the right. On the left, there is a point labeled C, located between the lines labeled 10 million years ago and 20 million years ago. There are two segments that branch out from point C; one leads to point D and the other to point E. Both points D and E are located on the line labeled 10 million years ago. Point E connects to two line segments, one of which ends with a point labeled F, which is located just above the line labeled 10 million years ago. The other line segment connected to Point E connects to Point G, which is located halfway between the lines labeled Present time and 10 million years ago. Point G is connected to two-line segments, one that branches to the left and one that branches to the right. The segment that leads to the left has a point that is labeled H, and the one that leads to the right has a point that is labeled I. Both points H and I are located on the line labeled Present time. The segment that connects to point B and leads to the right ends with Point J, which is located halfway between the lines labeled 10 million years ago and 20 million years ago. Two segments branch off from point J, one leading to Point K and one leading to point L. Point K is located below the line labeled 10 million years ago, and Point L is located on the line labeled 10 million years ago. There are two segments branching off from Point L, one leading to the left (which ends with Point M, located on the line labeled Present time) and one to the right (which ends with Point N, located below the line labeled Present time).

Part 1: Use this image to describe the relationship between H, F, and D, including how closely they are related to each other, and determine the most recent common ancestor for these species.
Part 2: Using the above image, estimate how long ago the common ancestor for H, F, and D lived.
Part 3: Of species H, F, and D, which have gone extinct without producing any evolutionary descendants? Provide evidence to support your answer.