Zoology Question
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Which of the following could be considered the most recent common ancestor of living tetrapods?
- a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates
- an armored gnathostome with two pairs of appendages
- an early ray-finned fish that developed bony skeletal supports in its paired fins
- a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fish