A group of small, lizard-like reptiles among which are the earliest known reptiles are ____
a. pelycosaurs
b. thecodontians
c. labyrinthodonts
d. therapsids
e. protorothyrids
e
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For over 200 years, a census of the entire United States population has occurred every
A) year. B) two years. C) five years. D) ten years. E) twenty years.
The body waves that can only pass through solids are
A) primary (P) waves. B) tertiary (T) waves. C) secondary (S) waves. D) quaternary (Q) waves.
Valencian is currently
A) classified as a dialect, although many of its speakers would prefer to have it classified as a distinct language. B) classified as a distinct language by a law passed by the Spanish government. C) classified as a dialect because there are so few speakers. D) not considered a dialect because there is no written language. E) a dead language since so few people speak it.
Disturbed deserts and marginal grasslands are slow to recover because
A plant growth is slow and there is little water B the flora become too diverse genetically C excessive water drowns out essential nutrients