If the population age structure of a country resembles a pyramid, with the pre-reproductive age group the largest proportion of the population, and the post-reproductive age group the smallest, this country can most likely be classified as one of the
A) stable populations.
B) least developed countries.
C) most developed countries.
D) steady-state populations.
E) expanding populations.
B
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The ATP molecule contains ______________
A. glucose B. glutamic acid C. 3 phosphate group D. ribose E. deoxyribose
Which of the following cytoskeletal filaments are capable of growing and shrinking in the cell?
A. microtubules B. intermediate filaments C. microfilaments D. Answers a and c are correct.
The abundant remains of ammonites in Oklahoma indicate that Oklahoma was
A. always a semi-arid grassland. B. once a vast desert with almost no rainfall. C. once a part of a mountain range that has now eroded. D. once covered by a shallow ocean. E. part of a vast tropical forest.
What characteristic gives C3 and C4 plants their names?
A) the sequence in which the carbon-containing molecules were discovered B) the botanically assigned geographic coordinates where the plants are located C) the first stable carbon compounds that are produced during the second portion of photosynthesis D) the first carbon compounds that are produced during the light reactions of each type of plant