Which grouping immediately follows Order in the classification hierarchy?
A) Genus
B) Family
C) Phylum
D) Class
B
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Water molecules are polar, with
a) the oxygen side being slightly positive and the hydrogen side being slightly negative. b) the oxygen and hydrogen sides being slightly positive. c) the oxygen and hydrogen sides being slightly negative. d) the oxygen side being slightly negative and the hydrogen side being slightly positive.
Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain becomes nonlethal. Type R Streptococcous pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host. B. The R strain would be transformed into the virulent S strain and kill the host. C. The S strain would be transformed into the nonvirulent R strain and not affect the host. D. The R strain would be transformed into the virulent S strain and not affect the host. E. Neither the S nor the R strain would change.
Movement of body parts directly requires the
a. endocrine system and nervous system. b. muscular system and skeletal system. c. skeletal system and digestive system. d. muscular system and cardiovascular system. e. nervous system and endocrine system.
Porifera differ from other animals in that they
A. do not form true organs B. are sessile C. have three germ layers D. have radial symmetry