Some dinosaurs had a wrist bone with a curved surface.

This half-moon shaped bone is shown in red.

Map the earliest appearance of the half-moon shaped wrist bone.

Great! The first appearance of such a wrist bone occurs in the Maniraptorans.

Let’s try the last feature.

Oops!

Take a closer look at the cladogram. You should map the spot before the first occurence a half-moon shaped wrist bone.

Try again.