Cephalopods are the only mollusks that possess
a. a mantle.
b. gills.
c. a closed circulatory system.
d. shells.
e. a closed circulatory system and shells.
Answer: c
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A. chemical weathering. B. subduction. C. biomineralization. D. inorganic mineralization. E. bacterial oxidation.
A primary difference between a normal cell and a cancerous cell is
a. the cell must be directly exposed to a carcinogen. b. the cell must lose normal cell division controls c. the cell must go through mitosis at least 25 times. d. the cell must be located in either connective tissue or muscle. e. the cell must be located in epithelial tissue..
Anaphylactic shock ________
A) occurs when blood vessels constrict abruptly B) is a symptom of an immunodeficiency disease C) causes blood pressure to drop dangerously D) has no treatment
Bacterial endosymbionts have lost much of their genome and are dependent upon their aphid hosts for survival. Similarly, the aphids depend on the endosymbiotic bacteria for the supply of amino acids that they provide. This interdependence is the result of
A. coevolution. B. amensalism. C. syntrophy. D. microbial antagonism.