Which of the Following Could Be Considered the Most Recent

question 28

Multiple Choice

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 armoured, jawed placoderm with two pairs of appendages
• C) an early 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 the side-to-side bending typical of fishes

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Definitions:

Bromination

The chemical reaction in which a bromine atom or molecule is introduced into another molecule.

Major Organic Product

The primary outcome of a chemical reaction involving organic reactants; it is usually the most abundant product formed.

Major Organic Product

In organic chemistry, the predominant compound that forms as the result of a chemical transformation.

Major Organic Product

The principal product formed in a reaction involving organic molecules, which is often the most stable or the one produced in the highest yield under the given conditions.