The oldest known vertebrates; a group of “bony-skinned” fish characterized by bony armor but

no jaws or teeth:a.
labyrinthodonts d. ostracoderms
b. therapsids e. placoderms
c. gymnosperms


D

Environmental & Atmospheric Sciences

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Which one of the following is a secondary pollutant?

A) sulfuric acid B) particulate matter C) volatile organics D) carbon monoxide

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Which of the following is not one of the major groups of terrestrial vegetation biogeographers often designate?

A) grassland B) forest C) savanna D) desert E) phytoplankton

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In the R,S system, which of the following groups has lowest priority?

A) alkyl B) amino C) hydroxyl D) thiol

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When Earth rotates on its axis and wobbles like a spinning top, it is known as ____

A) obliquity B) precession C) radiative forcing D) eccentricity

Environmental & Atmospheric Sciences