Which of the mollusks have a closed circulatory system?
a. clams
b. slugs
c. snails
d. squids
e. chitons
d
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Tularemia, characterized by glandular, ulceroglandular, oculoglandular, oropharyngeal, systemic, and pneumonic presentations, is caused by which of the following species?
a. Brucella b. Bordetella c. Pasteurella d. Francisella
An ecosystem is a community of ____ producers and ____ consumers that interact with one another and with their nonliving environment
a. energy-consuming; energy-producing b. primary; secondary c. autotrophic; heterotrophic d. heterotrophic; autotrophic e. nutrient cycling; heat producing
An ?NH2 group is a(n) ____ group
a. carboxyl b. hydroxyl c. amine d. methyl e. carbonyl
How might anthropogenic enhancement of the greenhouse effect result in increased primary production?
A) Warmer temperatures would lengthen the growing season and speed metabolism. B) Enhanced CO2 concentrations would increase the rate of photosynthesis. C) both of the above