In petrified wood, the wood has been replaced with the mineral _____.
A) calcite
B) feldspar
C) marble
D) amber
E) chert
Ans: E) chert
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Which of the following is not a soil conservation measure?
A) planting corn in vertical rows B) planting patches of grass between patches of corn C) terracing D) planting grass on water courses
Human beings have adapted to widely varying conditions on Earth through physical differentiation rather than cultural differentiation
Indicate whether the statement is true or false.
In what form do aromatic amines exist at physiological pH (pH= 7.4)?
A) largely as neutral molecules B) largely as their conjugate acids C) as a mixture of neutral molecules and their conjugate acid, but with a slight predominance of the conjugate acid D) as a 50/50 mix of neutral molecules and their conjugate acids
What percentage of Europe's population lives in urban areas?
A) three -fourths (75%) B) two-thirds (66%) C) one-fifth (20%) D) one-third (33%) E) one-half (50%)