Of the estimated 7-15 million eukaryotic species that Earth supports, biologists have described and assigned scientific names to about ________ of these species
A) 1.5 million B) 3 million C) 500,000 D) 5 million E) 1 million
A
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Which of the following alcohols will undergo acid-catalyzed dehydration most easily?
A) 1-butanol B) 2-butanol C) 2-methyl-2-propanol D) ethanol
How will increasing atmospheric CO2 affect the properties of seawater?
A) Seawater will have higher salinity B) Seawater will have lower density C) Seawater will have higher surface tension D) Seawater will have lower pH
A stream's equilibrium profile shows a delicate balance among gradient, discharge, flow velocity, channel shape and sediment load. We would say that the stream is ____
A)superposed B)incised C)graded D)divided E)braided
In the southeastern United States, the red fire ant is
A) a natural predator that is a dominant species in forest ecosystems. B) an invasive species that has caused a decline in biodiversity. C) used to control invasive insect species that could potentially hurt agricultural crops. D) has increased songbird populations that use it as food.