The U.S. and China currently rely on fossil fuels for how much of their energy needs?
A. 66 percent
B. 50 percent
C. 25 percent
D. 90 percent
Answer: D
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Hygroscopic water
A) is generally unavailable to plants because its high surface tension causes it to adhere so tightly to the soil particles. B) allows water to flow downward into the subsurface because it is often found in permeable soils. C) generally enhances transpiration rates by allowing plants to be more active. D) is water that runs off the surface after the soil reaches field capacity.
Which of the following statements are true? (i) the pKa of thiols is similar to that to phenols (ii) little or no hydrogen bonding occurs between thiol molecules (iii) thiols and disulfides are important in nucleic acid chemistry
A) (i) and (ii) only B) (i) and (iii) only C) (ii) and (iii) only D) (i), (ii) and (iii)
An anomalous amount of _______________ is found in the boundary clay of the 65 million-year-old K-T event
Fill in the blank with correct word.
Drowned glacial valleys along coastlines of submergence are called _______________
Fill in the blank(s) with correct word