An impermeable layer that prevents the passage of groundwater is a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
aquiclude
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Veins may look like white stripes cutting across a body of rock.
a. true b. false
Since the 1960s in the United States, public policies and high taxes on cigarettes to discourage smoking have
A) increased, and the number of adult smokers has been cut in half. B) increased, but the number of adult smokers has stayed about the same. C) increased, but the number of adult smokers has increased by about 50%. D) decreased, and the number of adult smokers has dropped by about 20%.
Recombinant DNA ________
A) is assembled in the lab from mononucleotides B) is the merging of DNA from unrelated organisms to create new genetic varieties C) was part of the Green Revolution of the 1960s D) is cross-pollination of one plant by a different species E) is pollination of one plant by another of the same species
The chemical formula of hydrogen cyanide is HCN. How many unshared electrons are associated with a molecule of hydrogen cyanide?
A) 2 B) 4 C) 6 D) 10