If an organism's diploid cells have 40 chromosomes, then its haploid cells have
A. 10 chromosomes.
B. 20 chromosomes.
C. 40 chromosomes.
D. 80 chromosomes.
Answer: B
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Which state has experienced the great declines in the Ogallala aquifer over the largest area?
A. Texas B. Kansas C. Nebraska D. Colorado
A temperature difference of 20 degree matches the same temperature difference on the
A. Fahrenheit scale. B. Kelvin scale. C. both of these D. neither of these
Which regions of a heating curve correspond to regions where two phases of a material are present?
A) horizontal regions B) regions with negative slope C) regions with positive slope D) It depends on the material.
In the U.S., the command-and-control environmental laws of the early 1970s, together with the ensuing amendments and updates that have been made to them over time,
A. were necessary as US industries had zero incentive to control pollution. B. were an inexpensive incentive for industrial polluters to improve performance. C. are given considerable credit for cleaner air and water in recent decades. D. draws distinctions between the needs of firms and costly equipment upgrades.