The gnathostomes were the first vertebrates to:
A) develop feathers. B) possess jaws. C) develop scales. D) develop gills.
Answer: B
You might also like to view...
What would happen if all of the structures corresponding to the one labeled 6 in Figure 41-1 were
removed from the neuron? a. Impulse transmission would be faster. b. Impulse transmission would be slower. c. Impulse transmission would cease. d. Continuous conduction would occur. e. There would be no effect on transmission
A very narrow pedigree, such as that for Egypt's Ptolemy dynasty, reflects
A) families with many adopted children. B) a very mild phenotype. C) many uncles marrying their nephews. D) families with many relatives having children with blood relatives
What is the proton-motive force used for?
a. diffusing substances across membranes and driving movement of flagella in bacteria b. pumping substances across membranes and driving movement of flagella in eukaryotes c. pumping substances across membranes and driving movement of flagella in bacteria d. diffusing substances across membranes and driving movement of flagella in eukaryotes
Where is the site of elongation of long bones?
A. in the diaphysis. B. in the growth plate epiphysis. C. as part of the articular cartilage. D. lining the bone marrow cavity.