Costa Rica is classified as a(n) ________ economy by the UN
A) low
B) lower middle
C) upper middle
D) high
C
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During the end Permian mass extinction, the die-offs were so extensive, ________ or more of animal species went extinct.
A. 47% B. 25% C. 80% D. 70%
Plate tectonics regards the lithosphere as divided into segments (plates) that are in horizontal motion.
Answer the following statement true (T) or false (F)
Which of the following is TRUE about Korean?
A) Written Korean has a letter for each sound. B) Korean is essentially Chinese spoke on the Korean peninsula. C) Korean uses two systems of phonetic symbols. D) The origin of Korean is unknown. E) Korean is written with the familiar Roman alphabet to simplify trade.
Unlike a transverse wave, a longitudinal wave has no
A) amplitude. B) frequency. C) wavelength. D) speed. E) all of the above