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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences