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
Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania)
The most common drug used to facilitate date rape is alcohol, not GHB.
Common Prefixes Used to Name Tumors
Prescriptions for common analgesics used in dentistry.
Common Suffixes Cont.
Three conformations of DNA. B-DNA is most common, A-DNA is likely an artifact of crystallization in