Which of the following fishes has a jaw,
scales, and a cartilaginous skeleton?
a. lampreys
b. goldfish
c. coelacanths
d. sharks
e. more than one of these
D
Biology & Microbiology
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Which of these structures is derived from an ancestral air-breathing lung in ray-finned fishes and is
used to increase buoyancy?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
Biology & Microbiology
Which situation is most likely to decrease genetic variation?
A. directional selection B. mutation C. stabilizing selection D. diversifying selection
Biology & Microbiology
Some pesticides can trigger
a. hives. b. joint pain. c. headaches. d. asthma. e. all of these.
Biology & Microbiology
________ cells provide for a rapid secondary immune response.
A) Memory B) Effector C) Cytotoxic T cells D) Mast E) Dendritic
Biology & Microbiology