The document presents a phylogenetic tree illustrating transitional forms in tetrapod evolution. It includes an interactive table for labeling skeletal features of tetrapod fossils based on three distinct groups focusing on neck features, bones in fins or feet, and limb support. Labels can be used variably across the groups, enhancing the educational experience.

1. This phylogenetic tree shows some of the transitional forms in tetrapod evolution. Drag the
labels onto this table about the skeletal features of tetrapod fossils. Targets of Group 1 identify
the neck features, targets of Group 2 identify the bones in fins or feet, and targets of Group 3
identify the support provided by limbs. Labels can be used once, more than once, or not at all.