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
Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d
Some common eye disorders. (A) Conjunctivitis (“pinkeye”).
Some common eye disorders. (D) Conjunctival hemorrhage of the right eye of this patient with ...
Common Suffixes Cont.
Common Ancestors
Three common eukaryotic promoter consensus sequence elements