Which Of The Following Could Be Considered The Most Recent Common Ancestor Of Living Tetrapods?

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Which Of The Following Could Be Considered The Most Recent Common Ancestor Of Living Tetrapods?

a. a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates b. an armored gnathostome with two pairs of appendages c. an eary ray-finned fish that developed bony skeletal supports in its paired fins d. a salamander that had legs supported by a bony skeleton but moved with side-to-side bending typical of fishes e. an early terrestrial caecilian whose legless condition had evolved secondarily
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