Method of determining where the ancestors of turtles and tortoises come from

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Method of determining where the ancestors of turtles and tortoises come from
Step 1: 71 species of living turtles and tortoises were examined and a total of 6
were taken from the bones of their forelimbs.
Step 2: The data was recorded on a 7
(necessary for comparing the
information). Outcome: Land tortoises were represented by a dense 8
of
points towards the top. Sea turtles were grouped together in the bottom part.
species and added to
Step 3: The same data was collected from some living 9
the other results. Outcome: The points for these species turned out to be positioned
about 10
up the triangle between the land tortoises and the sea turtles.
Step 4: Bones of P. quenstedti and P. talampayensis were examined in a similar way and the
results added. Outcome: The position of the points indicated that both these ancient
creatures were 11