The HIV genome is which of the following?
A) a single stranded DNA
B) a double stranded DNA
C) a single stranded RNA
D) a double stranded RNA
C
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Primates evolved from birds as indicated by their arboreal ancestry
a. True b. False
A large difference in temperature between a wet bulb and a dry bulb on a sling psychrometer indicates
A) that the air is cooling by adiabatic expansion. B) that the relative humidity is high. C) that substantial evaporation is occurring from the wet bulb.
Which environmental problem is among the five leading causes of death worldwide?
a. El Niño b. air pollution c. water pollution d. toxic waste e. nuclear waste
Which one of the following statements best reflects the overall position of current science on the role of biodiversity in ecosystems?
A) The more species in an ecosystem, the greater the biomass production. B) The more species in an ecosystem, the greater its drought resistance. C) The effects of biodiversity loss on ecosystem function depend on how many and which species are lost. D) Every species in an ecosystem is equally essential to maintain the overall ecosystem.