Fossil evidence indicates that complex life forms, capable of generating easily fossilized hard parts like shells or bones, have existed in abundance on Earth since approximately ________ years ago.
A. 5,440
B. 544 thousand
C. 544 million
D. 5,440,000,000
E. 544,000,000,000
Answer: C
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Of the following, the United States is best characterized as a
A) republic. B) confederation. C) nation-state. D) monarchy. E) supranational organization.
In terms of the periodic table, is there an abrupt or gradual change between ionic and covalent bonds?
A) There is an abrupt change that occurs across the metalloids. B) Actually, any element of the periodic table can form a covalent bond. C) There is a gradual change: the farther apart, the more ionic. D) Whether an element forms one or the other depends on nuclear charge and not the relative positions in the periodic table.
Atmospheric instability is caused by: a. warming the surface air and cooling the air aloft
b. warming the air at the surface and aloft. c. cooling the air at the surface and aloft. d. cooling the surface air and warming the air aloft.
What manufacturing region in North America is known for its aircraft and aerospace industries?
A) Gulf Coast, from southeastern Texas to Alabama B) Los Angeles and San Diego C) San Francisco Bay D) Southeastern, from Virginia through Alabama E) Pacific Northwest