Question

which organism does not have four walking legs? lancelet (outgroup) lamprey tuna salamander turtle leopard hair amniotic egg four walking legs jaws vertebral column salamander leopard turtle tuna

Explanation:

The diagram shows evolutionary relationships. Tuna is a fish and swims using fins, not walking legs. Salamanders, leopards, and turtles have four - walking legs as indicated by the trait on the diagram.

Answer:

Tuna