Question 3 point)
in the late 1980's scientists discovered a new fossil skeleton that changed their thinking about the events leading to life on land. This new fossil
had legs and feet, but ankles that were too weak to support it's weight on land. It had lungs and gills, but the rib cage was too short to prevent
the chest cavity from collapsing when the animal was on land. These structures suggested that limbs evolved before retrapods moved onto
land. What is the name of this new fossil skeleton?