Three species of tigers have become extinct due to overharvesting or habitat destruction. This is an example of
A. mass extinction.
B. background extinction rate.
C. sympatric speciation.
D. increased extinction rate by human activity.
E. allopatric speciation.
D. increased extinction rate by human activity.
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A(n) ________ is a chemical that can be used to sterilize materials.
A. disinfectant B. antiseptic C. oxidant D. sterilant
Which factors govern the rate of primary productivity in freshwater and marine ecosystems?
a. availability of water b. availability of sunlight and nutrients only c. depth of the water only d. depth of the water and availability of sunlight and nutrients e. availability of oxygen
According to one study, the heritability of IQ score in humans has a value of 0.52. What does this tell us about the role of "nature" versus "nurture" in determining intelligence in humans?
A) Intelligence is a qualitative trait, affected by both genetics and the environment, and it can't be predicted by heritability scores. B) Children of highly intelligent parents will likely be very intelligent, regardless of the environment in which they're raised. C) There is an approximately equal chance that children of intelligent parents will be as intelligent as their parents, depending on the environment in which they're raised. D) High heritability values don't mean that the intelligence of children can be accurately predicted because the environment plays a strong role.
Immunization for ________ may reduce the incidence of otitis media and sinusitis.
A. Mycoplasma pneumoniae B. Mycobacterium tuberculosis C. Propionibacterium acnes D. Corynebacterium diphtheriae E. Streptococcus pneumoniae