Which of the following kinds of organisms can manufacture the greatest variety of organic compounds?
A. aerobic bacteria
B. anaerobic bacteria
C. animals
D. plants
D. plants
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Which statement about genetic diversity is true?
a. Genetically diverse species are more likely to adapt and evolve. b. A genus with similar looking species has the highest potential to evolve. c. Genetic diversity refers to the variety of metabolic compounds in an ecosystem. d. Genetic diversity is positively correlated with latitude for most species.
Which statement best describes a keystone species?
A) a rare or uncommon species that has a strong effect on its community B) an abundant species that may or may not affect other species C) a species that takes up a great deal of space in a community D) a common species that has a strong effect on its community
Which experiment would not be considered an ecological study?
A) the effect of a housing development on a spotted salamander population in a vernal pool B) the effect of changing availability of acorns on a population of squirrels C) the effect of a red tide outbreak on sea birds in the area D) the effect of a hormone on the rate of blood vessel formation
In mammalian defenses against invading pathogens, all of these are considered nonspecific defense mechanisms EXCEPT
A. the skin. B. antimicrobial proteins (e.g., interferon). C. the inflammatory response. D. acquired immunity. E. mucous membranes.