Jaws appear to have evolved from
A) the fusion of many bony elements found in the skin of the neck region of jawless ancestors.
B) a large, bony shield that protruded from between the base of the pectoral fins.
C) modification of a disk of bones surrounding the mouth in lampreys.
D) skeletal rods that supported gill slits near the mouth.
Answer: D
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The nonpathogenic Mycobacterium commonly found in tap water, which has been a problem when tap water or deionized water has been used in the preparation of smears, is:
a. M. paratuberculosis. b. M. lepraemurium. c. M. phlei. d. M. gordonae.
Growth in population is a convenient way to express the rate of change within a population
1.True 2.False
Cheetahs were almost extinct but conservation efforts managed to save them. Now, most cheetahs are genetically identical. What phenomenon explains this?
A. Gene flow B. Bottleneck effect C. Natural selection D. Selective mating
Red blood cells
a. transport respiratory gases b. combat bacterial infection c. destroy viruses d. transport cholesterol