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
(A) Common sites for cholelithiasis; (B) a gallbladder specimen with multiple gallstones.
Ectopic pregnancies. (a) An ectopic pregnancy may occur in any of the locations shown. Interstitial
The coagulation cascade. Both the intrinsic pathway and extrinsic pathway lead to a common pathway ...
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Prescriptions for common analgesics used in dentistry.