The cyanobacteria were
A) chemoautotrophs.
B) responsible for introducing substantial amounts of oxygen into Earth's atmosphere.
C) the earliest known prokaryotes.
D) a group of heterotrophic bacteria.
B
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Eutrophication of Lake Washington near Seattle was largely addressed by limiting levels of
A) phosphate from nonpoint source discharges of pollution. B) phosphate from point source discharges of pollution. C) nitrates from nonpoint source discharges of pollution. D) nitrates from point source discharges of pollution.
Which hose appliance combines tow hose lines into one?
a. Siamese b. Manifold c. Reducer d. Wye
If a mid-latitude cyclonic storm has moved from the southwest toward the northeast during the past six hours, the storm is likely to move toward the ____ during the next six hours
A) northwest B) southwest C) southeast D) northeast
What principle, embodied by the phrase, "Waste not, want not," did rising consumerism threaten?
A) thrift B) charity C) democracy D) environmentalism E) capitalism