Which of the Following Could Be Considered the Most Recent

question 35

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
• E)an early terrestrial caecilian whose legless condition had evolved secondarily

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Definitions:

P Orbitals

Atomic orbitals shaped like dumbbells, consisting of regions where there's a high probability of finding an electron outside the nucleus, pivotal in chemical bonding and valence.

Highest Energy

Refers to the state of a system or particle where it possesses the maximum amount of energy compared to other possible states.

Antiaromatic

Compounds that have a cyclic, conjugated electron configuration but do not follow Huckel's rule, leading to instability.

Aromatic

Relating to or denoting organic compounds that have a planar ring structure with delocalized pi electrons, leading to enhanced stability.