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, 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
Answer: A
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Fill in the blank(s) with correct word
term meaning chewing
What will be an ideal response?
Gap junctions in animal cells are most similar to ________ in plant cells?
A. plasmodesmata B. primary cell walls C. tight junctions D. hemidesmosomes E. middle lamella
Which of the following additions have been made to principles of the central dogma of biology?
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